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Principles of Inheritance and Variation
Sex-limited and Sex-influenced Traits
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Concepts tested
- Sex-limited traits
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2003 AIPMT 1 question
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Pattern baldness, moustaches and beard in human males are examples of : -Sex-limited traits are controlled by autosomal genes, but they are expressed in only one sex, because their expression depends on the sex hormones.
The genes for beard and moustache growth are present in both men and women, but they are expressed only in males under the influence of testosterone.
Pattern baldness is also autosomal and expressed mainly in males because of the male hormones (strictly it is described as sex-influenced, since it is dominant in males and recessive in females).
Sex-linked traits, such as haemophilia and colour blindness, are due to genes on the X chromosome.
So these are examples of sex limited traits.