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Exam 9: Patterns of Inheritance

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Question 31

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After reading the paragraph below, answer the questions that follow. A man and his wife are having trouble having a baby. Using modern technologies, the woman's eggs are removed, fertilized with her husband's sperm, and implanted into her uterus. The procedure is successful, and the woman gives birth to a healthy baby boy. After a while, though, they discover that their son is colorblind and has blood type O. The woman claims that the child can't be theirs since she has blood type A and her husband has type B. Also, neither parent is colorblind, although one grandparent (the woman's father) is also colorblind. -In regard to the baby's colorblindness, a sex-linked recessive trait, you explain that

A) colorblindness often appears randomly, even if neither parent is colorblind.
B) the baby's father must have a recessive allele for colorblindness.
C) since colorblindness is sex-linked, a son can inherit colorblindness if his mother has the recessive colorblindness allele.
D) the eggs must have been accidentally switched, since males inherit sex-linked traits only from their fathers.

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Question 32

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Justin has type A blood and his wife Brittany has type B blood. Justin's parents both have type AB blood, and Brittany's parents also both have type AB blood. What are the chances that Justin and Brittany's son Theodore has type A blood?

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

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Question 33

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Which of the following statements regarding genetic testing is false?

Most people afflicted with recessive disorders are born to parents who were

Given the sex determination system in bees, we can expect that

Mendel conducted his most memorable experiments on

Which of the following statements regarding genotypes and phenotypes is false?

Female inheritance patterns cannot be analyzed by simply studying the X chromosome because

For most sexually reproducing organisms, Mendel's laws

The sex chromosome complement of a normal human female is

Amniocentesis and chorionic villus sampling allow for ________ and ________ of the fetus so that it can be tested for abnormalities.

The phenotypic ratio resulting from a dihybrid cross of two heterozygote individuals showing independent assortment is expected to be

After reading the paragraphs below, answer the questions that follow. Cats normally have a total of 18 toes, 5 on each front paw and 4 on each back paw. But some cats express the dominant phenotype for polydactyly, which results in the development of extra toes on one or more paws. Jake, a Canadian tabby cat, has 28 toes and is recognized by the Guinness Book of World Records as the cat with the most toes. -One of Jake and Lucy's kittens mates with another cat that has 18 total toes. What is the probability that one of their offspring would have 18 total toes?

Blood samples are taken from the heel of newborn babies to test for a mutation in the PKU gene, which, if left untreated and in severe cases, can lead to mental retardation, reduced skin pigmentation, and seizures. Which concept is being illustrated by this example?

A colorblind woman marries a man who is not colorblind. All of their sons, but none of their daughters, are colorblind. Which of the following statements correctly explains these results?

A testcross is

Using a six-sided die, what is the probability of rolling either a 5 or a 6?

Which of the following statements regarding hypotheses about inheritance is false?

All the offspring of a cross between a black-eyed Mendelian and an orange-eyed Mendelian have black eyes. What is the expected phenotypic ratio of a cross between two orange-eyed Mendelian?

Sickle-cell disease is an example of