Chapter 9 Final Study Guide

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  • 1/7 Questions

    Whether an allele is dominant or recessive depends on

    • How common the allele is, relative to other alleles.
    • Whether it is inherited from the mother or the father.
    • Whether is or another allele determines the phenotype when both are present.
    • Whether or not it is linked to other genes.
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About This Quiz

The 'Chapter 9 final study guide' assesses understanding of genetics, covering concepts like alleles, genotype, phenotype, and inheritance patterns. Key skills tested include identifying genetic makeup, dominance in alleles, and inheritance in organisms, essential for learners in biology.

Chapter 9 Final Study Guide - Quiz

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  • 2. 

    Two fruit flies with eyes of the usual red color are crossed, and their offspring are as follows: 77 red- eyed males, 152 red- eyed females. The gene that controls whether eyes are red r ruby is _____ and the allele for ruby is _____. 

    Explanation
    In this question, the offspring of the fruit flies have red eyes, which is the usual color. This suggests that red eyes are the dominant trait. Since the question mentions that the gene controlling eye color is sex-linked, it means that the gene is located on the sex chromosomes. In this case, the allele for ruby eyes, which is the recessive trait, must be located on the sex chromosome as well. Therefore, the correct answer is sex-linked, recessive.

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  • 3. 

    All the offspring of a white hen and a black rooster are gray. The simplest explanation for this pattern of inheritane is

    • Pleiotropy

    • Sex linkage

    • Codominance

    • Incomplete dominance

    Correct Answer
    A. Incomplete dominance
    Explanation
    Incomplete dominance is the simplest explanation for the pattern of inheritance in which all the offspring of a white hen and a black rooster are gray. In incomplete dominance, neither allele is completely dominant over the other, resulting in a blending or intermediate phenotype. In this case, the white allele and the black allele are not fully dominant, leading to the gray phenotype in the offspring.

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  • 4. 

    Edward was found to be heterozygous (Ss) for the sickle- cell trait. The alleles represented by the letters S and s are

    • On the X and Y chromosomes

    • Linked

    • On homologous chromosomes

    • Both present in each of Edward's sperm cell

    Correct Answer
    A. On homologous chromosomes
    Explanation
    The alleles represented by the letters S and s are on homologous chromosomes. This means that each chromosome in a pair carries one of the alleles. In Edward's case, he has one chromosome with the S allele and another chromosome with the s allele. This is why he is heterozygous for the sickle-cell trait.

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  • 5. 

    Most genes come in alternative forms called_____. A diploid individual with two identical versions of a gene is said to be ____ while an individual with two different versions of a gene is said to be _____.

    Correct Answer
    alleles, homozygous, heterozygous
    Explanation
    Genes can exist in different forms called alleles. When an individual has two identical versions of a gene, they are referred to as homozygous, meaning they have two of the same alleles for that gene. On the other hand, when an individual has two different versions of a gene, they are referred to as heterozygous, meaning they have two different alleles for that gene.

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  • 6. 

    A man who has type B blood and a woman who has type A blood could have children of which of the following phenotypes?

    • A, B, or O

    • AB only

    • AB or O

    • A, B, AB, or O

    Correct Answer
    A. A, B, AB, or O
    Explanation
    A man with type B blood has genotype BB, while a woman with type A blood has genotype AA. When they have children, their genotypes can combine in various ways. The possible combinations are: AA (type A), AB (type AB), BB (type B), or AO (type A). Therefore, the couple can have children with phenotypes A, B, AB, or O.

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  • 7. 

    The genetic makeup of an organism is called its _____, whiel the physical traits of an organism are called its _____.

    Correct Answer
    genotype,phenotype
    Explanation
    Genotype refers to the genetic makeup of an organism, which includes the specific combination of genes and alleles that an organism possesses. It determines the potential traits that an organism can have. On the other hand, phenotype refers to the physical characteristics and traits that are actually expressed by an organism as a result of its genotype interacting with the environment. Phenotype is observable and includes traits such as eye color, height, and behavior.

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  • Mar 20, 2024
    Quiz Edited by
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  • Dec 07, 2009
    Quiz Created by
    Smileyvic
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