Baldness in humans is a dominant, sex-influenced trait. Thisgene is on the autosomes, not the sex chromosomes, but how it isexpressed is influenced by the person's sex (due to hormonespresent, etc.). A man who is BB or Bb will be bald and will benon-bald only if he is bb. A woman will only be bald if she is BBand non-bald if she is Bb or bb (it's almost like B isdominant in males and b is dominant in females). Actually, becauseof the influence of other sex-related factors, most women who areBB never become totally bald like men do, but rather, their hairbecomes "thin" or sparse.

 

If two parents are heterozygous for baldness, what are the chancesof their children being bald?

 

Use a Punnett square to illustrate this. Note: because the sex of aperson does make a difference in how the gene is expressed, youneed to set this up as a dihybrid cross to account for the sex ofthe children.

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