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Question 1

Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square shows a cross in which the probability of offspring will have red eyes is 100 percent?

Revolt · Accepted Answer

C: Image with description 2 by 2 Punnett square. Columns labeled X superscript lowercase r and Y. Rows labeled X superscript uppercase R and X superscript uppercase R. Cells show X superscript uppercase R X superscript lowercase r, X superscript uppercase R Y, X superscript uppercase R X superscript lowercase r, and X superscript uppercase R Y.

Question 2

Which combination of alleles are always involved in the inheritance of a sex-linked trait?

Revolt · Accepted Answer

C: alleles that are carried on X and Y chromosomes

Question 3

Which statement is always true when describing sex-linked inheritance?

Revolt · Accepted Answer

B: The alleles are found on the X or Y chromosome.

Question 4

What is the purpose of using a pedigree?

Revolt · Accepted Answer

D: to understand patterns of inheritance in organisms

Question 5

Which is not considered a sex-linked trait?

Revolt · Accepted Answer

B: purple flower color in pea plants

Question 6

Which pedigree symbol is used to represent a female carrier of a recessive X-linked trait?

Revolt · Accepted Answer

D: Image with description A half-shaded circle.

Question 7

Which allele combination represents a female who is a carrier for an cap x -linked recessive disorder?

Revolt · Accepted Answer

B: cap x to the cap r th power cap x to the r th power

Question 8

Which allele combination represents a female who is heterozygous for a sex-linked trait?

Revolt · Accepted Answer

A: cap x to the cap r th power cap x to the r th power

Question 9

Which statement about inheritance is true?

Revolt · Accepted Answer

A: Fathers always determine the gender of the offspring in humans.

Question 10

How are the alleles for sex-linked traits inherited?

Revolt · Accepted Answer

A: They are passed from parents to offspring on the X and Y chromosomes.

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