17.5 codominance and multiple alleles

Question 1

co dominance definition

Answer 1

equally expressed in the phenotype

Question 2

multiple alleles definition

Answer 2

more than 2 alleles for a gene

Question 3

what are the multiple alleles for blood type?

Answer 3

I^A
I^B
I^O

Question 4

a man claims not to be the father of a child. the man is blood group O while the mother of the child is blood group A and the child is blood group AB. state, with your reasons, whether you think the man could be the father of the child.

Answer 4

the man is not the father due to no I^B allele

Question 5

in some breeds of domestic fowl, the gene controlling feather shape has 2 alleles that are codominant. when homozygous, allele A^s produces straight feather while the allele A^f produces frizzled feathers. the heterozygote for feather shape gives mildly frizzled feathers. draw a genetic diagram to show the genotypes and phenotypes resulting from a cross between a mildly frizzled cockerel and a frizzled hen. the gene for feather shape is not sex- linked

Answer 5

50% frizzled fowl (A^fA^f)

50% mildly frizzled fowl (A^fA^s)