Question

Which of the following three statements is
correct about red blood cells in mammals?
I. Red blood cells circulating in the blood have a
nucleus
II. Red blood cells have a similar function to
white blood cells.
III. Red blood cells are produced by the bone
.
IV. Life span of red blood cells is 280 days.
marrow.​

Answer 1

Answer:

ABO blood groups in humans are controlled by the gene I. It has three alleles-IA, IB and i. Since there are three different alleles, six different genotypes are possible. There are four phenotypes possible because humans are diploid and can have any two alleles at one time. Also, IA and IB when present together shows co-dominance, resulting in AB type and when they are present with I, they show dominance.

Hence, the correct answer is ‘Four’