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Exam 9: Patterns of Inheritance

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Question 1

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Attached earlobes are recessive to free earlobes.What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

A) 2:1
B) 1:1
C) 1:2:1
D) 3:1

E) A) and B)
F) None of the above

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Question 2

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________ genes violate Mendel's principle of independent assortment.

A) Codominant
B) Linked
C) Recessive
D) Pleiotropic

E) None of the above
F) All of the above

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Question 3

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

Assume that having three nostrils is inherited as a sex-linked trait on the Y chromosome.A man with three nostrils has a daughter who has a son with a man who has only two nostrils.What is the probability that the three-nostriled man's grandson has three nostrils?

Please read the following scenario to answer the following questions. 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) . -Janice's genotype is ________.

What is the best explanation for a BbCc × bbcc cross producing offspring in a 5:5:1:1 phenotypic ratio?

An individual who is homozygous ________.

Alleles are described as ________.

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The F₁ plants have yellow seeds.What is the expected phenotypic ratio of seed color of the offspring of an F₁ × F₁ cross?

Achondroplasia is a form of dwarfism caused by a dominant allele.The homozygous dominant genotype causes death,so individuals who have this condition are all heterozygotes.If a person with achondroplasia mates with a person who does not have achondroplasia,what percentage of their children would be expected to have achondroplasia?

Experience with dog breeding has taught geneticists ________.

What is the key to the recognition of incomplete dominance?

Which of these crosses will produce only heterozygous offspring?

Please read the following scenario to answer the following questions. 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) . -Mary has the genotype ________.

In humans,free earlobes (E) are dominant to attached earlobes (e) and the presence of freckles (F) is dominant to the absence of freckles (f) .If an individual heterozygous for both of these traits were to mate with an individual with attached earlobes and no freckles,what is the probability of having a child with attached earlobes and freckles?

The recombination frequency between gene B and gene C is 11%.The recombination frequency between gene B and gene D is 5%.The recombination frequency between gene C and gene D is 15%.What would be the arrangement of these genes on a linkage map?

In humans,the presence or absence of dimples is a trait controlled by a single gene.What is the genotype of an individual who is heterozygous for dimples?

This hypothetical pedigree for a disease in humans illustrated inheritance that is

In humans,the inheritance of ________ is best explained as being polygenic.

A couple has two female children.What is the probability that their next child will be male?