241.
Albinism is determined by a recessive gene in man . the presence of albinism in 50% children born to a couple proves that
A
Both parents are heterozygous for albinism
B
Father is homozygous normal and mother is heterozygous
C
Father is homozygous for albinism but mother is heterozygous
D
Both are homozygous
Answer :
Father is homozygous for albinism but mother is heterozygous
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242.
A dihybrid ratio of 1:4:6:4:1 is obtained instead of 9:3:3:1. This is an example of
A
Complementary gene
B
Supplementary gene
C
Polygenic inheritance
D
Incomplete dominance
Answer :
Polygenic inheritance
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243.
Convergent evolution of two species is associated with
A
Analogous organs
B
Recent common ancestor
C
Homologous organs
D
Different habitat
Answer :
Analogous organs
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244.
Which one of the following conditions in humans. is correctly matched with its chromosomal abnormality/linkage?
A
Klinefelters syndrome-44 autosomes $$+ XXY$$
B
Colour blindness - $$Y$$-linked
C
Erythroblastosis foetalis - $$X$$-linked
D
Downs syndrome - 44 autosomes $$+ XO$$
Answer :
Klinefelters syndrome-44 autosomes $$+ XXY$$
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245.
Struggle for existence and survival of the fittest theories were given y
A
Wallace
B
Darwin
C
Lamarck
D
None of the above
Answer :
Darwin
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246.
A genetic clone is
A
Plants produced by asexual means
B
Hybrid produced by sexual means
C
Homozygous plant produced by sexual means
D
Heterozygous plant produced by sexual means
Answer :
Plants produced by asexual means
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247.
The natural rate of mutation is
A
1 X 10-10
B
1X10-6
C
1 X 105
D
1 X 1010
Answer :
1X10-6
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248.
Non-ionozing radiations commonly used for inducing mutations in organisms are
A
UV-rays
B
Beta-rays
C
X-rays
D
Ganna-rays
Answer :
UV-rays
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249.
When a cluster of genes show linkage behaviour they
A
induce cell division
B
do not show a chromosome map
C
show recombination during meiosis
D
do not show independent assortment
Answer :
do not show independent assortment
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250.
A single recessive trait which can express its effect should occur on
A
Any autosome
B
Any-chromosome
C
X-chromosome of female
D
X- chromosome of male
Answer :
X- chromosome of male
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