Biology 1B - Sex-linked Inheritance - Quiz 80-100%

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

(The cirlce that is half purple half white)

Hemophilia is an X-linked recessive disorder (Xh) that is passed through generations and can be traced by using a pedigree. What is the probability that a female child of Charles and Marie would suffer from hemophilia? 0 percent 25 percent 50 percent 100 percent

0 percent

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?

1 .Xr . Y. XR .XRXr . XRY. XR .XRXr . XRY.

Hemophilia is an X-linked recessive disorder. What is the probability of the offspring having hemophilia for the cross that is shown in the Punnett square? 0 percent 25 percent 50 percent 75 percent

NOT 25 percent TRY 50 percent

How are the alleles for sex-linked traits inherited? They are passed from the Y chromosome in parents to the X chromosome in offspring. They are passed from the X chromosome in parents to the XY chromosome in offspring. They are passed from parents to offspring on the X and Y chromosomes. They are passed from any chromosome in the parents to the X or Y chromosome in the offspring.

NOT They are passed from any chromosome in the parents to the X or Y chromosome in the offspring. TRY They are passed from parents to offspring on the X and Y chromosomes.

Which allele combination represents a female who is a carrier for an X-linked recessive disorder? XRXr XrXr XRY XrY

XRXr

What is genotype for a recessive trait found on the female chromosome? Yh Xh XH YH

Xh

Which combination of alleles are always involved in the inheritance of a sex-linked trait? heterozygous alleles homozygous alleles alleles that are carried on X and Y chromosomes alleles that are carried on all chromosomes except the X and Y chromosomes

alleles that are carried on X and Y chromosomes

Hemophilia is an X-linked recessive disorder (Xh) that is passed through generations and can be traced by using a pedigree. Based on the pedigree that is shown, which describes John? carrier for hemophilia expresses hemophilia does not have hemophilia expresses hemophilia and died of complications

does not have hemophilia

What is the purpose of using a pedigree? to study the causes of traits that are acquired during an organism's life to understand patterns of inheritance in organisms to determine mating patterns in organisms to identify traits that are acquired during an organism's life

to understand patterns of inheritance in organisms