Question

A human gene which is Y-linked controls premature baldness. One allele leads to normal hair pattern while the other produces premature baldness

1. What are alleles?
2. If a man with premature baldness marries, work-out the phenotypes of his children. (Use letter R to represent gene for premature baldness).
3. A pair of genes occurring on chromosomes, controlling a particular trait./ Alternative form of a gene controlling a particular trait.
4. Explain why this trait is not observed in females
5. Give one other trait in man that is Y—linked

Answer 1

1. A pair of genes occurring on chromosomes, controlling a particular trait./ Alternative form of a gene controlling a particular trait
2. 
   
3. The gene is located only on the y chromosome; /have no alleles on the chromosome; females do   not inherit y-chromosome/females have xx only;
4. Hairs on the pinna/ nose;
5. webbed toes,