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Exam 10: Patterns of Inheritance

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Question 21

Multiple Choice

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In a dihybrid cross where both parents are heterozygous, the expected phenotypic ratio is

A) 1:2:1.
B) 9:3:3:1.
C) 1:1:1.
D) 3:1.
E) 1:1:1:1.

F) B) and E)
G) B) and D)

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Question 22

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The garden pea was a good model for Mendel's genetics experiments. Which of the following is a true statement regarding this model organism?

A) The plants were easy to grow.
B) Pea plants can either cross-pollinate or self-pollinate.
C) All inheritance patterns were simple.
D) Most of the traits studied had no intermediate stage.
E) All of the above are true statements.

F) A) and C)
G) B) and E)

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Question 23

Multiple Choice

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In a one-trait testcross, a homozygous dominant individual is crossed with a homozygous recessive individual. Which phenotype will be absent in the F ₁ generation?

Matt buys a male python from a snake dealer who tells him that the snake carries the albino allele. What is the most effective way for Morgan to verify this statement?

If the parental genotype is EeWw, what are the potential allele combinations that could occur at the end of meiosis?

Determine if the following statement is true or false. Parents with the dominant phenotype cannot have offspring with the recessive phenotype.

Which variable(s) will determine the coat color of a Himalayan rabbit?

If a true-breeding tall pea plant is crossed with a tall pea plant of unknown parentage, which of the following is correct?

Alport syndrome, a dominantly inherited X-linked disorder, is characterized by glomerulonephritis, end-stage kidney disease, and hearing loss. A mother with alport disease, whose father was unaffected, marries an unaffected man. What are the chances that she would give birth to a son with alport syndrome?

During meiosis, each pair of alleles on the homologous chromosomes sorts independently from all other pairs of alleles. This statement corresponds to

Matt buys a male python from a snake dealer who tells him that the snake carries the albino allele. Matt mates the snake with an albino female, and four normally pigmented offspring are produced. Matt rushes back to the snake dealer and demands his money back stating that the male he bought is not heterozygous for the albino allele because all of its offspring had normal pigmentation. Is Matt justified in his accusation?

Which genetic disorder is associated with an irregular shape of the red blood cells?

Traits that are controlled by several sets or pairs of alleles, such as skin color and height in humans, are the result of what form of inheritance?

Which of the following is a true statement?

Megan has a widow's peak (dominant trait) and attached earlobes (recessive trait) . Megan's dad has a straight hairline and unattached earlobes. If Megan marries a man that is heterozygous for both traits, what is the probability that they will have a child with a widow's peak and attached earlobes?

If an individual expresses a dominant disease, which of the following is true?

Which of the following is true about an individual with the chromosomes shown in this figure?

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?

What are all possible gametes that can be produced by an individual with the following genotype:FFGg?

Megan has a widow's peak (dominant trait) and attached earlobes (recessive trait) . Megan's dad has a straight hairline and unattached earlobes. What is Megan's genotype?