Chapter 11 Genetics Practice Quiz
Genetics is a branch of biology concerned with the study of genes and heredity in organisms. By studying genetics we get to have a clear idea of some diseases and consequently prevent diagnose and cure them. With the Block Bio test coming right up the quiz below on chapter 11 on genes is designed to help you know how ready you are to pass it. Give it a shot and all the best!
Questions and Answers
- 1.
Dominant will always mask the recessive allele.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because in genetics, the dominant allele is expressed and masks the effects of the recessive allele. This means that even if an individual has both a dominant and recessive allele for a particular trait, only the dominant allele will be visible in their phenotype. The recessive allele will only be expressed if an individual has two copies of it, meaning they are homozygous recessive.Rate this question:
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- 2.
Write the 2 dominant traits (homozygous and heterozygous) [use F and f] Heterozygous: ________ Homozygous: ________ Use and between the two
Correct Answer
Ff and FFExplanation
The correct answer is Ff and FF. This is because heterozygous traits have two different alleles, represented by different letters (Ff), while homozygous traits have two identical alleles, represented by the same letter (FF). In this case, Ff represents the heterozygous trait, while FF represents the homozygous trait.Rate this question:
- 3.
FF = Red ff = White Ff = Pink This is an example of a...
- A.
Genotype Incomplete Dominance
- B.
Phenotype Incomplete Dominance
- C.
Phenotype Codominance
- D.
Tri-Sessive Mixture
Correct Answer
B. Phenotype Incomplete DominanceExplanation
This example demonstrates incomplete dominance in the phenotype. In incomplete dominance, neither allele is completely dominant over the other, resulting in a blending or intermediate phenotype. In this case, the FF genotype produces a red phenotype, ff genotype produces a white phenotype, and Ff genotype produces a pink phenotype.Rate this question:
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- 4.
When Both alleles are present and show up unmasked...
- A.
This is Codominance
- B.
A Solid Mixture will show
- C.
A heterozygous allele
- D.
This is Incomplete Dominance
- E.
Dominance
- F.
Both will show, ex. Silver Stars and Polka Dots
Correct Answer(s)
A. This is Codominance
C. A heterozygous allele
F. Both will show, ex. Silver Stars and Polka DotsExplanation
The given answer correctly explains that when both alleles are present and show up unmasked, it is an example of codominance. In codominance, both alleles are expressed fully and neither is dominant or recessive over the other. The answer also mentions that a heterozygous allele will be present, which means that the individual carries two different alleles for the same trait. The example given of "Silver Stars and Polka Dots" further illustrates that both alleles are expressed and visible in the phenotype.Rate this question:
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- 5.
Multiple Alleles are...
- A.
A 3 or more allele mix being heterozygous
- B.
Example: Blood TISSUE
- C.
More than 2 alleles control the phenotype for a certain trait
- D.
Doesn't create co-dominance
Correct Answer
C. More than 2 alleles control the phenotype for a certain traitExplanation
Multiple alleles refer to a situation where more than two alleles exist for a particular gene in a population. These different alleles can control the phenotype, or observable characteristics, of an organism. In the case of blood tissue, there are three alleles - A, B, and O - that determine the blood type. Each individual can have two of these alleles, resulting in different blood types. This phenomenon does not create co-dominance, where both alleles are expressed equally, but rather follows a specific pattern of dominance and recessiveness.Rate this question:
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- 6.
In Blood types there is A B O. Does it have 3 alelles? (Hint: doesn't exactly go along with the multiple alleles amount) And Are A and B codominant?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The question is asking if there are 3 alleles in blood types, which doesn't necessarily align with the concept of multiple alleles. The answer is true because blood types indeed have three alleles (A, B, and O). Additionally, the question asks if A and B are codominant, which is also true as both alleles can be expressed simultaneously in individuals with AB blood type.Rate this question:
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- 7.
Type A (blood can)..
- A.
Has a Genotype of (I^A)(i)
- B.
Has a Phenotype of High Sodium Blood
- C.
Can Donate to O
- D.
Can Donate to Type AB
- E.
Receives from Type A or Type O
Correct Answer(s)
A. Has a Genotype of (I^A)(i)
D. Can Donate to Type AB
E. Receives from Type A or Type OExplanation
The given correct answer states that Type A blood has a genotype of (I^A)(i), which means it carries both the A and the O alleles. This genotype allows Type A blood to donate to Type AB because Type AB individuals have both A and B antigens on their red blood cells. Type A blood can also receive blood from Type A or Type O individuals because Type A blood can recognize and accept both A and O antigens.Rate this question:
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- 8.
Type B (Blood) can...
- A.
Genotype - (I^B)(I^B)
- B.
Receives type A blood not AB
- C.
Donate to AB
- D.
Receives from Type O
Correct Answer(s)
A. Genotype - (I^B)(I^B)
C. Donate to AB
D. Receives from Type OExplanation
The given answer is correct because individuals with Type B blood have the genotype (I^B)(I^B), which means they have two copies of the B allele. This genotype allows them to donate blood to individuals with Type AB blood because the AB blood type has both A and B antigens, and the B antigen is compatible with the B allele. Additionally, individuals with Type B blood can receive blood from individuals with Type O blood because Type O blood does not have A or B antigens, making it compatible with any blood type.Rate this question:
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- 9.
Type O blood's genotype is ii
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The genotype for Type O blood is ii, which means that it lacks both A and B antigens on the red blood cells. This is the correct answer because individuals with Type O blood have two copies of the "i" allele, which does not produce any antigens.Rate this question:
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- 10.
Polygenic Traits are traites that are controlled by only 2 genes
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Polygenic traits are traits that are controlled by multiple genes, not just two genes. These traits are influenced by the interaction of many different genes, each contributing a small effect to the overall phenotype. Therefore, the statement that polygenic traits are controlled by only 2 genes is incorrect.Rate this question:
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- 11.
Autosomes are Chromosomes from 1 to ______
Correct Answer
22Explanation
Autosomes are chromosomes that are not involved in determining the sex of an individual. In humans, there are a total of 23 pairs of chromosomes, with one pair being the sex chromosomes (X and Y) and the remaining 22 pairs being autosomes. Therefore, the correct answer is 22.Rate this question:
- 12.
Sex Chromosomes consist of...
- A.
X Only
- B.
X and 2 Y's
- C.
Y Only
- D.
X and Y
Correct Answer
D. X and YExplanation
Sex chromosomes consist of X and Y. In humans, females have two X chromosomes (XX) and males have one X and one Y chromosome (XY). The presence of the Y chromosome determines the development of male characteristics, while the absence of the Y chromosome leads to the development of female characteristics. Therefore, the correct answer is X and Y.Rate this question:
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- 13.
Femlaes Inactive one of their X chromosomes
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Females have two X chromosomes, but in order to prevent an overdose of X chromosome genes, one of the X chromosomes is inactivated. This process is known as X chromosome inactivation or Lyonization. It occurs randomly in early embryonic development and results in the formation of a Barr body, which is a condensed, inactive X chromosome. This inactivation ensures that both males and females have an equal dosage of X chromosome genes. Therefore, the statement "Females inactive one of their X chromosomes" is true.Rate this question:
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- 14.
Female = XX while Male = ________
Correct Answer
xy
XY
yx
YXExplanation
The given question is asking for the counterpart of "Female = XX" in terms of the genetic makeup of males. In humans, females have two X chromosomes (XX), while males have one X and one Y chromosome (XY). Therefore, the correct answers are "XY" and "YX" as they represent the genetic makeup of males.Rate this question:
- 15.
Sex Linked traits are found on DNA
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Sex Linked traits are found on the X chromosomeRate this question:
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- 16.
Recessive traits on the X chromosome are more likely to appear in men because they have only 1 X chromosome
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Men have one X chromosome and one Y chromosome, while women have two X chromosomes. This means that if a man inherits a recessive trait on his X chromosome, he will express that trait because he does not have another X chromosome to mask it. In contrast, women have two X chromosomes, so even if they inherit a recessive trait on one X chromosome, they may have a dominant allele on the other X chromosome that masks the recessive trait. Therefore, recessive traits on the X chromosome are more likely to appear in men.Rate this question:
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- 17.
Sex Linked Traits Examples are
- A.
Fertility amounts
- B.
How tall a person will eventually be
- C.
Red/green colorblindness
- D.
Increase in hair amounts
Correct Answer
C. Red/green colorblindnessExplanation
Red/green colorblindness is an example of a sex-linked trait because it is caused by a gene located on the sex chromosomes, specifically the X chromosome. This means that the trait is more commonly seen in males, as they only have one X chromosome and are more likely to inherit the gene. Females, on the other hand, have two X chromosomes and would need to inherit the gene from both parents to exhibit the trait. Red/green colorblindness is characterized by difficulty in distinguishing between red and green colors.Rate this question:
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- 18.
Pedigrees show a family history tracing for one specific trait
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Pedigrees are diagrams that show the inheritance of a specific trait or condition within a family. They are commonly used in genetics to track the occurrence of genetic disorders or traits within a family tree. By analyzing a pedigree, one can determine patterns of inheritance and identify individuals who are carriers or affected by the trait. Therefore, the statement that pedigrees show a family history tracing for one specific trait is true.Rate this question:
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- 19.
NonDisjunction
- A.
Unequal Separation of chromosomes during meiosis 2 in ANAPHASE
- B.
Equal Separation of Mitosis though, Unequal in Meiosis 2 in ANAPHASE
- C.
Unequal Separation of chromosomes during meiosis 1
Correct Answer
C. Unequal Separation of chromosomes during meiosis 1Explanation
During meiosis 1, homologous chromosomes separate, resulting in two daughter cells with an unequal distribution of chromosomes. This is known as non-disjunction. Non-disjunction can lead to genetic disorders and abnormalities in the offspring, as the resulting cells may have an abnormal number of chromosomes. In contrast, during meiosis 2, sister chromatids separate, resulting in four daughter cells with an equal distribution of chromosomes. Therefore, the correct answer is "Unequal Separation of chromosomes during meiosis 1."Rate this question:
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- 20.
Nondisjunction can happen in meiosis 1 and also meiosis 2
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
During meiosis, the process of cell division that produces gametes (sperm and eggs), nondisjunction can occur in both meiosis 1 and meiosis 2. Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly, resulting in an abnormal distribution of chromosomes in the resulting gametes. This can lead to genetic disorders such as Down syndrome. Therefore, the statement that nondisjunction can happen in both meiosis 1 and meiosis 2 is true.Rate this question:
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- 21.
Nondisjuction - It produces sex cells with ___proper amounts of chromosomes
Correct Answer
im - 22.
Non-Disjunctional can only occur in sex chromosomes
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Can occur in autosomalsRate this question:
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- 23.
Body Cells Have
- A.
23 cells
- B.
46 cells
- C.
92 cells
Correct Answer
B. 46 cells -
- 24.
X Inactivation is when females turn off 1 x-chromosome (pick and chose the best variation)
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
X inactivation is a natural process that occurs in female mammals, including humans, where one of the X chromosomes in each cell is randomly inactivated. This is to ensure equal gene expression between males and females, as males only have one X chromosome. The inactivated X chromosome becomes a condensed structure called a Barr body. This process occurs early in embryonic development and is maintained throughout the individual's life. Therefore, the statement that X inactivation is when females turn off one X chromosome is true.Rate this question:
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- 25.
A Hemophiliac is a normal trait
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
A Hemophiliac is not a normal trait. Hemophilia is a genetic disorder that affects the blood's ability to clot, resulting in excessive bleeding. It is caused by a mutation in one of the genes responsible for blood clotting. People with hemophilia have a deficiency or absence of certain clotting factors, which can lead to spontaneous bleeding or excessive bleeding following injuries or surgeries. This condition is inherited and cannot be considered a normal trait.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
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Nov 30, 2011Quiz Created by
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