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Exam 29: Heredity

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Question 41

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Environmentally produced phenotypes that mimic conditions that may be caused by genetic mutation are called phenocopies.

A) True
B) False

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Question 42

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Match the following: -The gene allele that suppresses or masks the expression of the other allele.

A) Allele
B) Dominant
C) Heterozygous
D) Autosomes

E) B) and C)
F) A) and D)

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Question 43

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When two genes are on the same chromosome,they are considered linked.

The expression of all physical traits is strictly due to the inheritance of specific genes.

Down syndrome is an example of nondisjunction of chromosomes.

Which of the following statements is true concerning genetic screening?

Dominant alleles are so called because under most circumstances they ________.

Assume that the allele controlling brown eyes (B)is dominant over that controlling blue eyes (B)in human beings.(In actuality,eye color in humans is an example of polygene inheritance,which is much more complex than this.)A blue-eyed man marries a brown-eyed woman,and they have six children,all brown-eyed.What is the most likely genotype of the father? What is the most likely genotype of the mother? If a seventh child had blue eyes,what can you conclude about the parents' genotypes?

What would be the gametes of the first-generation individuals?

Color blindness is a(n)________ trait.

Figure 29.2 Use Figure 29.2 to answer the following: -Is the trait dominant or recessive?

Match the following: -Chromosomes regulating most body characteristics.

For which of the following are newborn infants not routinely screened at birth?

Match the following: -Inheritance that results in continuous or qualitative phenotypic variations between two extremes; an example is skin color.

Match the following: -A disorder of brain lipid metabolism.

Match the following: -Results in chromosomes that have mixed contributions from each parent.

Sex chromosomes of a normal male are ________.

Match the following: -A chromosome pair that may be very different in size.

The ABO blood type is a good example of a(n)________ inheritance.

In humans,farsightedness is inherited by possession of a dominant gene.If a man who is homozygous for normal vision (aa)marries a woman who is heterozygous for farsightedness,what proportion of their children would be expected to be farsighted?