Two individuals decide to have children. the expected blood group genotypes are 50% of blood type a, and 25% each of blood types ab and b. what genotypes are the parents?
a. ia i x ii
b. ib i x ia ib
c. ia i x ia ib
d. ia i x ib i

C. IA i x IA IB

Explanation:

If one individual is with genotype IA i it means that it has A blood type. This is because IA allele is dominant over i allele. Another individual with genotype IAIB has th AB blood type because allele IA is codominant to allele IB (both alleles are expressed when are together in heterozygous).

P: IAi x  IAIB

F1: IAIA  IAIB  IAi  IBi

IAIA and IAi are genotypes that will give A blood (1/2)

IAIB- AB blood type (1.4)

IBi- B blood type (1/4)

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.