Question

Pattern baldness, mustache, and beard in human males are an example of
(a)Sex liked traits
(b)Sex limited traits
(c)Sex differentiating traits
(d)Sex determining traits

Answer 1

Hint: Moustache and beard are characteristics of human males and aren't found in the case of females. Pattern baldness in males is due to the effect of androgen which is a sex hormone of the male whereas, in the case of females, the reason for pattern baldness is still unclear.

Complete answer:
Moustache and beard are found in only human males and pattern baldness is also controlled by a dominant gene that gets expressed in the presence of male hormones which makes these three traits sex-limited traits. These traits are not seen in female humans.

Additional Information: Sex limited traits- These traits are present in both male and female sexes. But these get expressed in only one sex and stays turned off in the other sex. These are responsible for sexual dimorphism which is reflected in size, color, behavior, and Morphology. The genes that influence milk production in mothers or responsible for the pattern baldness in males are sex-limited.
Sex-linked traits- Sex influenced or sex-linked traits are related to genes that control a characteristic located on a sex chromosome. These are mainly x-linked because of the lesser number of genes available on the shorter Y chromosome. Some examples of sex-linked conditions are red-green color blindness and hemophilia.
Sex determining traits- These traits determine the development of sexual characteristics in an organism and make them male or female or hermaphrodite. It’s genetic and both sexes have different alleles that specify their morphology sexually.
So, the correct answer is “Sex limited traits”.

Note: Sex limiting is traits are different from sex-linked or sex-influenced traits as it is restricted to only autosomal traits whereas sex-linked has to do with genetic differences on sex chromosomes and in sex-influenced traits, the genes show differential expression in each sex.