Biology Chapter 7 Test Review-Extending Mendelian Genetics

Someone who is heterozygous for a recessive allele that causes a disorder

• is not a carrier of the disorder.

• will not have the disorder.

• cannot have offspring with the disorder.

• will get the disorder late in life.

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Phenotype is influenced by many factors, including the chromosome upon which a gene is located, ranges of dominance, and

• karyotype

• pedigree

• environment

• phenotype

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The Punnett square in Figure 7.1 shows a cross between two parents who are heterozygous for an autosomal genetic disorder caused by a recessive allele. People with which genotype will have the disorder?

• Ss parent

• Ss offspring

• SS offspring

• ss offspring

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The wide range of eye color indicates that eye color is

• sex-linked

• recessive

• polygenic

• epistatic

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One parent is homozygous for a recessive allele and one parent is heterozygous for a recessive allele in an autosomal dominant genetic disorder. What is the chance that a child of those two parents will have the disorder?

• 25%

• 50%

• 75%

• 100%

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An XX female will express a recessive sex-linked trait if she

• has several codominant alleles for the gene

• fully expresses her Y chromosome

• is homozygous for the recessive allele

• carries the allele on an epistatic gene

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Suppose a mouse is homozygous for alleles that produce black fur and homozygous for alleles of an epistatic gene that produces albinism. What color fur will the mouse have?

• white

• black

• gray

• spotted

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The crossing over of wild type fruit flies with mutant fruit flies resulted in the conclusion that some

• traits assort independently

• chromosomes are inherited as a group

• genes assort independently

• traits are inherited as a group

Two genes on a linkage map are 9 map units apart. This means that in 9 percent of the offspring, the phenotypes from those genes will

• appear codominant

• disappear

• appear together

• not appear together

A female is born with attached earlobes, which is a recessive phenotype. Which of the following statements about her parents must be true?

• Neither has the codominant allele

• Her father has an inactivated allele

• Both parents have the recessive allele

• Her mother carries the dominant allele

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