some traits have multiple alleles in a population. For example, ABO blood type h
ID: 255014 • Letter: S
Question
some traits have multiple alleles in a population. For example, ABO blood type has three Alleles: ________, _________, and ________, __________ and ___________ are codominant. If both parents are AB tye, what are the possible genotype of their children? ____________________________________________?
A cross between a parent with dominant phenotype (A) and a parent with recessive phenotype (a) is called a ______________ cross. It is used to find out the genotype of the dominant parnet. If all offspring have dominant phenotype, this parent's genotype should be _____________; if dominant to recessive is 1:1, this parent's femotype should be ___________?
Hemophilia is a __________________ disorder. Both parents are normal, their son has hemophilia. What is the mother's genotype? _______________. What is the father's genotype _________________? What is the son's genotype ________________? Her possible genotype should be __________ or ________?
Explanation / Answer
Three alleles - A,B and O allele.
A and B are codominant.
Possible blood group of children - A, B and AB.
Cross with dominant parent with recessive parent is called test cross.
If all are dominant then genotype of parent is AA.
If ratio of dominant to recesive is 1:1 then genotype is Aa.
Hemophilia is X linked recessive disorder.
If son has hemophilia then genotype of mother is XcX.
Father's genotype is XY.
Son's genotype is XcY.
Daughter's genotype should be XcX or XX.
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