Pedigree Charts
Hemophilia, disease in which the blood lacks a clotting factor, is caused by an X linked recessive gene. Joe doe not have hemophilia and Lucille is heterozygous for the condition. What is the chance that their MALE child will have hemophilia? (Note: you are calculating the probability for their MALE children only, in other words if they have 1 male child, what is the probability that he will be born with the disease?)
-0%
-1/4 or 25%
-2/4 or 50%
-3/4 or 75%
-4/4 or 100%
In humans, having facial dimples is dominant to not having facial dimples. Mary has dimples, yet only 3 of her 10 children have dimples. What must Mary’s genotype be?
-homozygous dominant
-heterozygous
-homozygous recessive
-has dimples
-does not have dimples
Red-green color blindness is an X-linked recessive disorder. If Allison is heterozygous (a carrier), and her husband, Michael, is NOT colorblind. What is the chance that their male children will be colorblind? (Note: you are calculating the probability for their MALE children only, in other words if they have 1 male child, what is the probability that he will be born with the disease?)
-0%
-25% or 1/4
-50% or 2/4
-75% or 4/4
-100% or 4/4
Red-green color blindness is an X-linked recessive disorder. If Allison is heterozygous (a carrier), and her husband, Michael, is NOT colorblind. What is the chance that their female children will be colorblind? (Note: you are calculating the probability for their FEMALE children only, in other words if they have 1 female child, what is the probability that she will be born colorblind?)
-0%
-25% or 1/4
-50% or 2/4
-75% or 3/4
-100% or 4/4
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