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Exam 23: Patterns of Gene Inheritance

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Question 1

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When crossing organisms with differing genotypes, you can expect your actual results to match the predicted results 100% of the time.

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Question 2

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A man with blood type O would not be able to father a child with

A) blood type A.
B) blood type B.
C) blood type AB.
D) blood type O.
E) any blood type.

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C

Question 3

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Given that curly hair (WW) and straight hair (ww) exhibit incomplete dominance, what are the chances that two individuals with wavy hair will have a curly-haired child?

Mr. X has been accused by Miss Z of fathering her child. The child's blood type is AB and Miss Z's blood type is A. Which blood type(s) would eliminate Mr. X as a possible father of the child?

Huntington disease is an autosomal dominant disorder that leads to progressive degeneration of brain cells. There is no effective treatment for the disorder and individuals usually die in their 40s or 50s, 10 to 15 years after the onset of symptoms. Which of these statements about Huntington disease is true?

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 expressing both traits?

If T = tall and t = short in plants, the genotype of a short plant would be

If the genotype of an organism is YySsTt, then yST would represent

In peas, the yellow seed color is dominant (YY or Yy) over the green seed color (yy) . You have been given a plant that only produces yellow seeds and need to determine if the plant is YY or Yy. Which of the following crosses would be most effective for determining the genotype of your plant?

The ability to roll the edges of the tongue upward in a U-shape is inherited as a dominant allele at a single gene locus. Which of the following genotypes would produce an individual that can roll their tongue?

Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers. What are the genotypes of the two parents? (W = widow's peak; S = short fingers)

What pattern of inheritance is shown in the following pedigree? What is the probability that the affected son in generation III will pass the trait on to his children?

In the determination of eye color, the HERC2 gene overrides the instructions of the OCA2 gene. If individuals are homozygous for a recessive allele of HERC2, they will have blue eyes regardless of the genotype associated with OCA2. This is an example of

In a testcross, an organism with a dominant phenotype, but unknown genotype, is crossed with an organism that is

How many alleles are required to express a monohybrid trait?

If the probability in any pregnancy of having a boy is 50%, then what is the probability of having 3 boys in a row?

In which kind of monohybrid cross would you expect to find a phenotypic ratio of 3:1 among the offspring?

In humans, an individual who has wavy hair is a heterozygote with one curly hair allele and one straight hair allele. Indicate the phenotypic and genotypic ratios expected for the offspring from a straight-haired man and a wavy-haired woman.

Two parents heterozygous for cystic fibrosis have a child with the disease. The parents are expecting a second child. What is the probability that the second child will also have cystic fibrosis?

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?