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Exam 4: Single-Gene Inheritance

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Question 21

Multiple Choice

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Mendel called physical units responsible for the inheritance of traits "characters." The basis for his first law is that characters

A) separate from each other during meiosis.
B) are carried on separate chromosomes.
C) can exist as multiple alleles.
D) are inherited in random combinations.
E) can be cloned using nuclear transfer.

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Question 22

Multiple Choice

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In the Foofnagle family,the trait of being able to yodel affects members of both sexes in every generation.This trait could be

A) autosomal recessive or autosomal dominant.
B) autosomal recessive but not autosomal dominant.
C) autosomal dominant but not autosomal recessive.
D) conclusive or inconclusive.
E) caused by something in the environment and not inherited at all.

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Question 23

Multiple Choice

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The difference in mode of inheritance between Huntington disease and cystic fibrosis is that

A very difficult aspect of Huntington disease is that

A Punnett square displays

When Mendel crossed pure breeding peas having yellow seed color (YY) with pure breeding peas having green seed color (yy) ,all of the offspring had yellow seed color.These results mean that yellow seed color is the

Eric and Janelle are carriers of the recessive allele causing Tay-Sachs disease,which is lethal in early childhood.If they have a healthy child,what is the probability that this child would NOT be a carrier of Tay-Sachs disease?

In a human pedigree that traces the inheritance of sickle cell disease,a half-filled circle represents a

A heterozygote has

Ian and Bryony are both carriers for two autosomal recessive disorders,PKU (chromosome 12) and cystic fibrosis (chromosome 7) .They are expecting a daughter.What is the probability that she will have PKU but not CF?

A very narrow pedigree,such as that for Egypt's Ptolemy dynasty,reflects

The second generation resulting from a genetic cross is the _______ generation.

An autosomal dominant trait

Sickle cell disease is inherited as an autosomal recessive trait.The genotype of an individual with sickle cell disease is

A(n) ______ cross yields a genotypic ratio of 1:2:1 and a phenotypic ratio of 3:1.

The genotypic ratio expected from a dihybrid cross involving complete dominance is

In a human pedigree that traces the inheritance of albinism,a filled square represents a

Which of the following represents a monohybrid cross?

In pea plants,the allele for tall (T) is dominant to the allele for short (t) .The genotype for a short pea plant is __.

Jaden is six years old.His sister Hillary has the autosomal recessive condition neuronal ceroid lipofuscinosis that affects learning and coordination.Their parents are healthy.The probability that Jaden is a homozygote for the wild type allele of the gene that causes the condition is