Trivia Quiz On Genetics Revision

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| By Stephen_Horton

Stephen_Horton

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Quizzes Created: 1 | Total Attempts: 2,017

Questions: 8 | Attempts: 2,017 | Updated: Aug 29, 2023

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Have you been keeping your nose in a book and revising the knowledge you’ve been picking up on genetics at school? You might think you know your stuff, but we’ll see if you can put your money where your mouth is in the following quiz and answer all of the questions on genetics – the topic which allows us to look at our genetic variation, genes, and heredity. Good luck!

Questions and Answers

1.

What is a dominant allele?
- A.
  
  A dormant gene that is never expressed
- B.
  
  The allele that will always be expressed if present
- C.
  
  The allele that will only be expressed if there are two present
Correct Answer
B. The allele that will always be expressed if present

Explanation
A dominant allele is an allele that will always be expressed if it is present. This means that even if there is only one copy of the dominant allele in an individual's genetic makeup, it will still be expressed and override the effects of any other alleles that may be present.

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2.

If blue eye colour (b) is recessive to brown eyes (B), what would be the genotype of a brown eyed person?
- A.
  
  Bb or BB
- B.
  
  Bb or BB Bb or BB
- C.
  
  Bb or Bb
Correct Answer
B. Bb or BB Bb or BB

Explanation
The genotype of a brown-eyed person can be either Bb or BB. Brown eye color is dominant over blue eye color, so a person with brown eyes can have either two dominant alleles (BB) or one dominant and one recessive allele (Bb).

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0
3
3.

If blue eye colour (e) is recessive to brown eyes (B) and two heterozygous parents have a child, what is the chance that the childs phenotype will be blue eyed? *Hint* Try a Punnett square.
- A.
  
  100%
- B.
  
  75%
- C.
  
  50%
- D.
  
  25%
Correct Answer
D. 25%

Explanation
When two heterozygous parents (Bb) have a child, there is a 25% chance that the child will have a blue eye phenotype. This can be determined using a Punnett square, where the possible genotypes of the child are BB, Bb, Bb, and bb. The bb genotype represents the blue eye phenotype, and since there is only one out of the four possible genotypes that results in blue eyes, the chance is 25%.

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1
0
4.

If blue eye colour (e) is recessive to brown eyes (B), what is the genotype of a purebred brown eyed person
- A.
  
  BB
- B.
  
  Bb
- C.
  
  Bb
Correct Answer
A. BB

Explanation
A purebred brown eyed person would have the genotype BB. This means that both of their alleles for eye color are brown (B), and they do not carry the recessive blue eye color allele (e). Since brown eye color is dominant over blue eye color, a person with the genotype BB will always have brown eyes.

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5.

What is a phenotype?
- A.
  
  The genetic code for a trait
- B.
  
  The physical expression of a trait
- C.
  
  A new type of pen
- D.
  
  The original cell of an organism
Correct Answer
B. The physical expression of a trait

Explanation
A phenotype refers to the physical expression of a trait. It is the observable characteristics or traits of an organism that are determined by its genetic code. This includes traits such as eye color, height, and hair type. The phenotype is influenced by both genetic factors and environmental factors, and it can vary among individuals within a population.

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2
0
6.

What are the components that make up the structure of DNA
- A.
  
  Meiosis and Mitosis
- B.
  
  A, T, C
- C.
  
  Phosphate group, pentose sugar, nitrogen base
- D.
  
  Cell, nucleous, membrane
Correct Answer
C. Phosphate group, pentose sugar, nitrogen base

Explanation
The correct answer is "Phosphate group, pentose sugar, nitrogen base." These three components are the building blocks of DNA. The phosphate group and pentose sugar (deoxyribose) form the backbone of the DNA molecule, while the nitrogen bases (adenine, thymine, cytosine, and guanine) pair up to form the rungs of the DNA ladder. Together, these components create the structure of DNA, which is essential for storing and transmitting genetic information.

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1
0
7.

How many chromosomes are contained in the sperm of a human?
- A.
  
  12
- B.
  
  23
- C.
  
  46
- D.
  
  92
Correct Answer
B. 23

Explanation
The correct answer is 23 because human sperm cells contain half the number of chromosomes compared to other human cells. This is because during fertilization, the sperm cell fuses with an egg cell, which also contains 23 chromosomes, resulting in a total of 46 chromosomes in the resulting zygote.

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8.

How many chromosomes are present in the zygote from which a human grows
- A.
  
  12
- B.
  
  23
- C.
  
  46
- D.
  
  92
Correct Answer
C. 46

Explanation
The zygote from which a human grows contains 46 chromosomes. Chromosomes are thread-like structures that carry genetic information and are found in the nucleus of cells. In humans, each parent contributes 23 chromosomes, resulting in a total of 46 chromosomes in the zygote. These chromosomes contain the DNA that determines an individual's traits and characteristics.

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Current Version
Aug 29, 2023

Quiz Edited by
ProProfs Editorial Team
Mar 31, 2011

Quiz Created by
Stephen_Horton

Trivia Quiz On Genetics Revision

What is a dominant allele?

If blue eye colour (b) is recessive to brown eyes (B), what would be the genotype of a brown eyed person?

If blue eye colour (e) is recessive to brown eyes (B) and two heterozygous parents have a child, what is the chance that the childs phenotype will be blue eyed? *Hint* Try a Punnett square.

If blue eye colour (e) is recessive to brown eyes (B), what is the genotype of a purebred brown eyed person

What is a phenotype?

What are the components that make up the structure of DNA

How many chromosomes are contained in the sperm of a human?

How many chromosomes are present in the zygote from which a human grows

If blue eye colour (e) is recessive to brown eyes (B) and two heterozygous parents have a child, what is the chance that the childs phenotype will be blue eyed? Hint Try a Punnett square.