HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 96:

• JAMB 2010

The chromosome number of a cell before and after the process of meiosis is conventionally represented as

A. 2n → 2n
B. N → n
C. N → 2n
D. 2n → n

Question 97:

• JAMB 2010

At what stage in the life history of a mammal is the sex of an individual set?

A. At adolescence
B. At puberty
C. At birth
D. At conception

Question 98:

• JAMB 2010

If both parents are heterozygous for a trait, the probability that an offspring will be recessive for that trait is

A. \(\frac{1}{2}\)
B. \(\frac{3}{4}\)
C. \(\frac{1}{4}\)
D. 1

Question 99:

• JAMB 2011

The inheritable characters that are determined by a gene located on the X-chromosome is

A. Recessive
B. Sex-linked
C. Homozygous
D. Dominant

Question 100:

• JAMB 2011

If the cross of a red-flowered plant with a white-flowered plant produces a pink-flowered plant, it is an example of

A. Codominance
B. Incomplete dominance
C. Mutation
D. Linkage