The name given to a sudden change in a gene or chromosome that can be passed on to the offspring is

A. inheritance

B. linkage

C. alleles

D. mutation

In humans, sex is determined by

A. two homologous chromosomes

B. a dominant gene for maleness present in a male

C. two similar sex chromosomes in the male and dissimilar in the female

D. the differences in the nature of the X and Y chromosomes in the male.

A man with heterozygous genotype for blood group B marries a woman with heterozygous A, what percentage
(%) of their children would be universal donor?

A. 50%

B. 25%

C. 15%

D. 10%

The genes affecting the same trait and are located at the same position on the homologous chromosomes
are called

A. autosomes

B. alleles

C. loci

D. chromatids

Which of the following is an adaptation by plants to reduce the rate of water loss in a dry habitat? Possession of

A. a few sunken stomata on the lower epidermis only

B. long leaf tendrils

C. leaves with serrated edges

D. strong tap root

The following are social insects except

A. wasps

B. termites

C. bees

D. cotton stainer

Which of the following can be considered as a direct evidence of evolution?

A. Classification

B. Comparative anatomy

C. Comparative embryology

D. Fossil record