In heterozygous condition, both the alleles express in

Options

A. Colour blindness
B. AB blood group
C. Rh factor
D. A and B blood types

Answer

B

Explanation

• The gene (I) has three alleles ,`I^(A),I^(B)` and i. The alleles `I^(A)` and `I^(B)` produce a slightly different form of the sugar while allele i doesn.t produce any sugar.
• Because humans are diploid organisms, each person possesses any two of the three I gene alleles.
• `I^(A)` and `I^(B)` are completely dominant over i, in other words when `I^(A)` and i are present only `I^(A)` expresses (because i does not produce any sugar), and when `I^(B)` and i are present is `I^(B)` expresses.
• But when `I^(A)` and `I^(B)` are present together they both express their own types of sugars: this is because of co-dominance. Hence red blood cells bave both A and B types of sugars.