JAMB Biology Past Questions & Answers - Page 313

1,561.

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.

1,562.

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.

1,563.

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.

1,564.

People with sickle-cell anaemia have haemoglobin

A.

S and are homozygous recessive

B.

A and are heterozygous recessive

C.

S and are heterozygous recessive

D.

A and are homozygous recessive

Correct answer is A

No explanation has been provided for this answer.

1,565.

The difference and similarities among living things account for

A.

diversity

B.

stability

C.

competition

D.

evolution

Correct answer is D

No explanation has been provided for this answer.