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Exam 5: Beyond Mendels Law

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Question 1

Multiple Choice

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Epistasis and multiple alleles differ in that

A) epistasis is an interaction between two different chromosomes, and multiple alleles affect a single gene.
B) epistasis is an interaction between two genes, and multiple alleles are variants of the same gene.
C) epistasis affects males and multiple alleles occur in females.
D) epistasis only occurs in genes that have multiple alleles.
E) in epistasis one gene masks another, but one allele cannot mask the effect of another.

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Question 2

Multiple Choice

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Different alleles that are both expressed in a heterozygote are

A) dominant.
B) codominant.
C) incompletely dominant.
D) homozygous dominant.
E) automatically dominant.

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Question 3

Multiple Choice

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Geneticists construct linkage maps of chromosomes by

Can a woman with blood type A have a child with blood type O with a man who is AB?

A widely-used research technique used to associate patterns of genetic variation with phenotypes that is based on the concept of linkage,but considering all of the chromosomes at once,is

Some combinations of recessive alleles cause problems so severe that the fetus ceases to develop.Such lethal allele combinations appear to alter Mendelian ratios because

Mitochondrial DNA differs from nuclear DNA in that it

The mitochondrial genome consists of ___ genes.

Types of genetic markers include

Hairlessness in dogs is inherited from a single dominant allele.Inheriting two dominant alleles is lethal for the embryo.Ralph and Penelope are both hairless dogs.What is the probability that Penelope will give birth to a hairy puppy?

A man who has normal hearing and has a recessive deafness allele on chromosome 17 marries a woman who also has normal hearing and also has a recessive deafness allele,but this allele is on chromosome 3.The probability that their children will be deaf due to either of these mutated genes is closest to

A trait caused by an environmental influence that appears to be inherited is

Mitochondrial disorders are probably very rare because

If allele T (long tongue) exhibits incomplete dominance over the recessive allele t (short tongue) ,a heterozygote for this gene would most likely have

Which of the following is an illness caused by a mutation in mitochondrial DNA?

A and B are linked genes.A heterozygote for both genes would show which configuration if the genes are in cis?

Marfan syndrome can be caused by mutations in either of two genes,but mutations in one of the genes blocks activity of the other.This means that Marfan syndrome demonstrates

Of nearly 200 forms of hereditary deafness,132 are autosomal recessive,64 autosomal dominant and 4 X-linked recessive.Hereditary deafness is therefore genetically

Multiple alleles are common because

Marbles is a Manx cat whose tail is so short that she appears not to have one.The genotype for short tail in Manx cats is heterozygous (Mm) .Cats that are genotype mm have normal length tails,but cats that are genotype MM die before birth due to very abnormal brains and spinal cords.Marbles has one copy of a recessive _____ allele.