HLA-2-DRA22 HLA-2-DRB1 HLA-2-DRB240 HLA-2-DRA3 HLA-2-DRB20 HLA-2-DRB240 You have

Question

HLA-2-DRA22 HLA-2-DRB1 HLA-2-DRB240 HLA-2-DRA3 HLA-2-DRB20 HLA-2-DRB240 You have inherited the two chromosomes depicted above with the 6 genes at 3 loci. Except for the alleles at the 3rd locus, every allele is different. For example, you have inherited the 3 genes HLA-2-DRA22, HLA-2-DRB1, HLA-2-DRB240. Draw out the possible genes found in the final gametes after Meiosis Il. What genes CAN be found in one gamete at the end of Meiosis II, if crossing-over has not occurred? HLA-2-DRA22, HLA-2-DRB1, HLA-2-DRB240 HLA-2-DRA22, HLA-2-DRB240, HLA-2-DRB20 HLA-2-DRA22, HLA-2-DRB20, HLA-2-DRB240 HLA-2-DRA3, HLA-2-DRB1, HLA-2-DRB240 HLA-2-DRA3, HLA-2-DRB20, HLA-2-DRB240 Save Question 3 (1 point) f5 f6 num

Explanation / Answer

Answer- The options A,C and E are the correct options.

Explaination: During a cross-over, 2 chromatids exchange genes.

Now since the DRB is linked, they won't seperate but the DRA can be swapped.

So the 2 DRBs of 1st chromosome and DRA of second chromosome combinations and vice versa are the correct answers.

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