Biology JAMB Past Questions

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1151

If a DNA strand has a base sequence TCA, its complementary strand must be

A. ATG
B. TAG
C. GAT
D. AGT

View Answer & Discuss (21) JAMB 2003

1152

A man and his wife are both heterozyous for the sickle-cell trait. The likely percentage of their offspring that will be either carriers or sicklers is

A. 75%
B. 50%
C. 25%
D. 100%

View Answer & Discuss (8) JAMB 2003

1153

If the pair of alleles for baldness is given as Bb, a female carrier will be denoted by

A. X^bY^B
B. X^BX^B
C. X^BY
D. X^BbX^b

View Answer & Discuss (10) JAMB 2003

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1154

An organism that has been extensively used to test the chromosomes theory of heredity is

A. Drosophila melanogaster
B. Muscar domestica
C. Zea mays
D. Homo sapiens

View Answer & Discuss (11) JAMB 2003

1155

A feature associated with the Y-chromosome in human is

A. long eyelashes
B. prominent fingernails
C. facial hairs
D. enlarged breast

View Answer & Discuss (7) JAMB 2003

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