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Exam 23: Patterns of Gene Inheritance

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Question 41

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Tay-Sachs is a recessive genetic disease in humans.If one parent is homozygous normal and the other is a carrier (heterozygous) ,what are the chances that their child will have this disease?

A) 0%
B) 25%
C) 50%
D) 75%
E) 100%

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Question 42

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A woman who can roll her tongue (presumably dominant) is married to a man who cannot.Two of their four children can roll their tongues and two cannot.If A = roll tongue and a = cannot roll tongue,then what is the genotype of the parents?

A) woman Aa; man Aa
B) woman AA; man aa
C) woman Aa; man AA
D) woman Aa; man aa
E) woman aa; man aa

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Question 43

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What will the genotypic ratio be of a monohybrid cross of two individuals who are heterozygous for a trait?

Which is NOT true according to Mendel's law of segregation?

You have two true-breeding rose bushes,one with red flowers and one with white flowers,a cross between these two roses yields a bush with white flowers that have red splotches.What condition does this demonstrate?

In which kind of cross could you expect to find of ratios of 1:1:1:1 among the offspring?

Cold weather can change the ______ of a Himalayan rabbit.

What are alleles?

If an individual with a dominant phenotype is crossed with an individual with a recessive phenotype,4 of their 9 offspring show the recessive phenotype.What is the genotype of the dominant parent?

Hydrangeas are a flowering plant with large showy blooms.When a plant is grown in aluminum rich soil it has blue flowers; if the same plant is transplanted into soil that is lacking aluminum the flowers produced will be pink.This is an example of

Which allele combination represents a recessive monohybrid trait?

In humans,aniridia,a type of blindness,is due to a dominant allele A.Migraine headaches are due to another dominant allele M.If a man who suffers from both conditions (AaMm) marries a woman who suffers from both (AaMm) ,what are the chances of an offspring having both traits?

A man with widow's peak (dominant) who can curl his tongue (dominant) has a child who has a continuous hairline and cannot curl the tongue.What is the genotype of the father?

Which of the following would be considered a heterozygous dihybrid genotype?

The skin pigment melanin is expressed differently according to exposure to sunlight,with a greater production of the molecule with greater exposure.However,the degree of production can never exceed the inherited genetic level.What evolutionary advantage would be gained from having this phenotypic range for skin pigmentation?

If the probability of event A is 3/4 and the probability of event B is 1/4,then the probability of both A and B occurring at the same time is

Unattached earlobes (EE or Ee) are dominant over attached earlobes (ee) .A couple both have unattached earlobes.Both notice that one of their parents on both sides have attached earlobes (ee) .Therefore,they correctly assume that they are carriers for attached earlobes (Ee) .If the couple proceeds to have four children,then

Consider skin color to be regulated by three genes A,B and C.All recessive alleles would be 0 or white on the color scale.All dominant alleles would be 6 or black on the color scale.What color is a person with AAbbCc genotype?

The inheritance of blood types in humans can be explained by

Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder) .Three children in a row were born with Tay-Sachs disease.What is the chance that a fourth child will have Tay-Sachs disease?