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Select the incorrect statement from the following.
A
Baldness is a sex limited trait
B
Linkage is an exception to the principle of independent assortment in heredity
C
Galactosemia is an inborn error of metabolism
D
Small population size results in random genetic drift in a population
Detailed Solution
Baldness is a sex-influenced trait, not a sex-limited one: the gene is autosomal and is present in both sexes, but it behaves as dominant in males and recessive in females because of the influence of male sex hormones.
Sex-limited traits are expressed in only one sex, e.g., milk production in females or beard in males.
Linkage: genes on the same chromosome tend to be inherited together and do not assort independently, so it is an exception to independent assortment (true).
Galactosemia is caused by the lack of an enzyme of galactose metabolism; it is an inborn error of metabolism (true).
Genetic drift, the random change in allele frequency, is significant in small populations (true).
Hence the incorrect statement is that baldness is a sex limited trait.
Sex-limited traits are expressed in only one sex, e.g., milk production in females or beard in males.
Linkage: genes on the same chromosome tend to be inherited together and do not assort independently, so it is an exception to independent assortment (true).
Galactosemia is caused by the lack of an enzyme of galactose metabolism; it is an inborn error of metabolism (true).
Genetic drift, the random change in allele frequency, is significant in small populations (true).
Hence the incorrect statement is that baldness is a sex limited trait.