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Exam 9: Patterns of Inheritance

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Question 31

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The best definition of a purebred plant is one that ________.

A) cannot be cross-fertilized
B) passes on the next generation only those traits identical to the parent
C) produces sterile offspring when cross-fertilized
D) self-fertilizes to produce hybrid offspring

E) None of the above
F) C) and D)

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Question 32

Multiple Choice

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A mating between a purebred purple-flowered pea plant and a purebred white-flowered pea plant would produce a(n) ________.

A) purebred variety
B) hybrid
C) P generation
D) F₂ generation

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

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Question 33

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The ________ is most commonly found in nature.

What is the key to the recognition of codominance?

Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a dominant allele. It can be traced back through a family's history using pedigree analysis. The pedigree shown here is of three generations of a family. Notice that some individuals (shown in gray) have a widow's peak (W = dominant allele and w = recessive allele) . -This pedigree supports the fact that widow's peak is due to a dominant allele, because if it were due to a recessive allele and both parents show the recessive phenotype, then ________.

An individual who is homozygous ________.

Please read the following scenario to answer the following question. The parents of a child with unusual disease symptoms take the child to a doctor for help. The doctor suspects that the condition might have a genetic basis. She recommends that the child be taken to a specialty clinic where physicians and staff members are trained to diagnose genetic diseases and counsel parents. Ultimately, the child is diagnosed with a rare recessively inherited disease. The parents are tested for the gene, and both are found to be heterozygous. The parents want to have another child but are afraid this child will also be affected. -What would genetic counselors say is the probability that the second child will have the disease?

An individual with the blood group genotype L^MLN has the phenotype MN. What is the relationship between the L^M and L^N alleles?

Scientists have long been interested in differences between dogs and wolves in their social behavior toward humans. Dogs and wolves share a common ancestor. In trying to understand the differences, a researcher analyzed data collected from 18 domesticated dogs and 10 wolves that had been raised by humans. Which data would be most useful to this study?

Linked genes are usually ________.

A BbCc × bbcc cross that produces offspring in a 5:5:1:1 phenotypic ratio is evidence of ________.

Alleles are described as ________.

Experience with dog breeding has taught geneticists that ________.

What is the specific location of a gene on a chromosome?

Red-green colorblindness is inherited as a sex-linked recessive trait. The gene is found on the X chromosome. Can a man with normal color vision father a daughter who is red-green colorblind?