JAMB Biology Past Questions & Answers - Page 314

1,566.

Breathing root is an adaptation for survival in the

A.

mangrove swamp

B.

desert

C.

arboreal habitat

D.

savanna

Correct answer is A

No explanation has been provided for this answer.

1,567.

A man who has the trait for colour blindness marries a normal woman. What percentage of their children would be sufferers, carriers and normal respectively

A.

25%, 25%, and 50%

B.

25%, 50%, and 25%

C.

50%, 25%, and 25%

D.

25%, 37.5%, and 37%

Correct answer is A

No explanation has been provided for this answer.

1,568.

The sex-linked defect in which very slight cut produces severe bleeding is known as

A.

anaesmia

B.

anorexia

C.

haemophilia

D.

haemolysis

Correct answer is C

No explanation has been provided for this answer.

1,569.

If a woman's genotype is Tt Qq Rr, what would be the gene content of her eggs?

A.

TQr, tqr

B.

TQR, tqr

C.

TqR, tQr

D.

tQr, TQR

Correct answer is B

No explanation has been provided for this answer.

1,570.

In the gene locus for eye colour in humans, the allele for brown eye is dominant over the allele for blue eyes. If a homozygous brown-eyed girl has a brother with blue eyes, what are the likely phenotypes of there parents' eye colour (Eye colour is not a sex linked trait)?

A.

Both parents have blue eyes

B.

Their father has blue eyes and their mother has brown eyes

C.

both parents have brown eyes

D.

Their mother has the blue eyes and their father has the brown eyes

Correct answer is C

No explanation has been provided for this answer.