2002 - JAMB Biology Past Questions and Answers - page 5
41
If XN is the dominant allele for normal vision and Xn the recessive allele for colour blindness, a boy with the genotype YXn will be
A
have normal vision
B
be colour-blind
C
be totally blind
D
be a carrier of colour blindness
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42
The first four children of a couple were all girls. The probability that the fifth will also be a girl is
A
1/5
B
1/4
C
1/3
D
1/2
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43
Genetic counselling is important when a marriage is planned between a
A
Rh- woman and Rh man+
B
Rh- woman and Rh- man
C
Rh+ woman and Rh+ man
D
Rh+ woman and Rh- man
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44
What proportion of the offspring of a cross between two heterozygous parents will exhibit the recessive condition phenotypically
A
1/4
B
1/2
C
3/4
D
4/4
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45
A
make the body react to emergencies
B
lower blood glucose level
C
raise the level of calcium ions in the blood
D
facilitate the development of facial hairs
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46
A
IV
B
III
C
II
D
I
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47
A
IV->II->III->I
B
III->II->I->IV
C
II->III->IV->I
D
I->III=>II->IV
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48
An amoeba and an unlaid chicken egg are
A
anial tissue
B
organelles
C
single cell
D
organisms
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49
In corns, food is usually stored in the
A
leaves
B
stems
C
roots
D
buds
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50
The animals that move by means of flagella include
A
Chlamydomonas and Euglena
B
Planeria and Amoeba
C
Amoeba and Hydra
D
Paramecium and Planeria
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