14. Why is a recessive sex-linked allele always expressed in human males, but no

Question

14. Why is a recessive sex-linked allele always expressed in human males, but not always expressed in females?      

15.  Make a diagram of an unduplicated chromosome containing two different genes, gene A and gene B. Use this diagram to explain gene locus andgene linkage.

        b.   Why does gene linkage interfere with independent assortment?

c.     Suppose the genotype of an organism is AaBb. If the genes A and B are linked on one chromosome (as in part a, above), and their recessive alleles, a and b, are on the other homologue, how many different genetic types of gametes would be produced in the absence of crossover? List them. Note: You should be able makes a diagram of meiosis to show how these gametes would be produced.

Explanation / Answer

14. Males carry one X and one Y chromosme, they inherit the X chromosome from their mother. Females inherit one X chromosoem from mother and another from father. In X- linked recessive disorders such as hemophelia, males are more affected because carryong one defective allele can cause disease in case of males, where as females must have two defective alleles. As males always inherit one X chromosoem from their mother, these are more chances for them to get affeted than females.

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