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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

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  1. A pair of genes occurring on chromosomes, controlling a particular trait./ Alternative form of a gene controlling a particular trait

  2. BioSukPP2A2b
  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,
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