WAEC Biology Past Questions & Answers - Page 131

651.

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

Correct answer is B

No explanation has been provided for this answer.

653.

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

Correct answer is B

No explanation has been provided for this answer.

654.

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

Correct answer is D

No explanation has been provided for this answer.

655.

Which of the following is not a morphological variation in human beings?

A.

Size

B.

Blood groups

C.

Colour

D.

Fingerprints

Correct answer is B

No explanation has been provided for this answer.