JAMB Biology Past Questions & Answers - Page 273

1,361.

If the offspring of a cross between a brown mouse (bb) and a black mouse (BB) are allowed to interbreed, how many different genotypes would result?

A.

2

B.

3

C.

4

D.

5

Correct answer is B

Cross between bb and BB → Bb   Bb   Bb   Bb

Bb genotype fills the first filial generation

1,362.

Which of the following characterizes the white mangrove?

A.

Prop roots

B.

Buttress roots

C.

Breathing roots

D.

Stilt roots

Correct answer is C

No explanation has been provided for this answer.

1,363.

The sign + is used to indicate an association where an organism gains, while 0 is used where an organism is unaffected. An association indicated as +0 is known as

A.

predation

B.

commensalism

C.

parasitism

D.

competition

Correct answer is B

No explanation has been provided for this answer.

1,364.

A soil consisting of alumina and iron (II) oxide is known as

A.

loamy soil

B.

clayey soil

C.

laterite

D.

podzol

Correct answer is C

No explanation has been provided for this answer.

1,365.

The construction of dams may lead to an increase in the prevalence of

A.

typhoid fever, measles, and yellow fever

B.

tuberculosis, leprosy, and trypanosomiasis

C.

guinea worm, malaria, and tuberculosis

D.

malaria, bilharziasis, and onchocerciasis

Correct answer is D

No explanation has been provided for this answer.