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More Genetics Problems, Yippee!
Blood-Type Problems. Remember that A and B are codominant and that o is recessive!
1.
If a man with blood type AB marries a woman heterozygous for type A, what is the
probability that their child will be type B?
2.
A mother has type A blood and a father has type B blood. If their baby has type O blood,
what is the genotype of the parents?
3.
Use a punnett square to show the possible genotypes and phenotypes for blood type of
the offspring of two parents, one with blood type O and one with blood type AB.
4.
Two women gave birth to girls in the same hospital at the same time. The nurses think
they may have accidentally switched the babies' name tags and given the babies to the wrong
parents. One baby, Jane, is type O. The other baby, Mary, is blood type A. The father in one
set of parents, the Reds, is blood type A, and the mother is type B. The father in the other set of
parents, the Greens, is blood type AB, and the mother is type O. Figure out which baby belongs
to which parents. Show your work and reasoning.
Sex-Linked Problems. Remember to show females as XX and males as XY!
2.
Color blindness is a sex-linked recessive trait. What is the probability that a color blind
woman and a color-blind man will have: a. a normal sighted son b. a color blind daughter
2.
What is the probability that two parents with normal color vision will have color blind
sons or daughters if the mother's father is color -blind?
4.
Hemophilia is a sex-lined blood disorder. People with this disease can bleed to death
from a small cut because their blood does not clot. It is caused by a recessive allele. You are a
normal (homozygous) female who is about to marry a hemophiliac male. What are your
chances of having a child with this blood disorder?
4.
In Drosophila, the gene for red eye color, “R”, is dominant to the gene for white eye
color, “r”. The trait is sex-linked. A red-eyed male was bred to a heterozygous red-eyed
female. Mark true/false.
__________The genes for eye color are carried on the X chromosome.
__________The male's genotype is XRYr.
__________The female's genotype is XRXr.
__________Half of the gametes produced by the female should contain Xr.
__________All the gametes produced by the male should contain Yr.
__________Of the offspring produced, all females are expected to have red eyes.
__________Of the offspring produced, all males are expected to have white eyes.
__________The offspring of a white-eyed male must have the genotype XrY.
__________Female offspring produced from this cross could have the genotype XrXr.