In: Biology
A gene showing codominance-
Select one:
a. has alleles that are recessive to each other
b. has alleles expressed at the same time in development
c. has alleles tightly linked on the same chromosome
d. has one allele dominant to the other
e. has both alleles independently expressed in the heterozygote
Answer is (e).
in codominance, both the alleles of a gene express themselves in heterozygotes. as a result heterozygotes for such genes possess the phenotype produced by both the alleles of such genes.
eg. An example of codominance that occurs in humans is that of blood type.
Parents IAIB X IAIB
Gametes IA IB IA IB
Progeny
Gametes |
IA |
IB |
IA |
IAIA BG : A |
IAIB BG : AB |
IB |
IAIB BG : AB |
IBIB BG : B |
BG : blood group