91.
The scientist who first discovered cytoplasmic -inheritance was
A
Correns
B
Rhoades
C
Mendel
D
Morgan
Answer :
Correns
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92.
A person with the sex chromosomes $$XXY$$ suffers from
A
Down's syndrome
B
Klinefelter's syndrome
C
Turner's syndrome
D
Gynandromorphism
Answer :
Klinefelter's syndrome
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93.
Potato and sweet potato
A
Have edible parts which are harmologous organs
B
Have edible parts which are analogous organs.
C
Have been introduced in India from the same place
D
Are two species of the same genus
Answer :
Have edible parts which are analogous organs.
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94.
Mendel chose character in pea
A
Three
B
Two
C
One
D
Seven
Answer :
Seven
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95.
When a plant have two alleles of contrasting characters it is called
A
Homozygous
B
Dioecious
C
Heterozygous
D
Monoecious
Answer :
Heterozygous
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96.
An allele is dominant if it is expressed in
A
both homozygous and heterozygous states
B
second generation
C
heterozygous combination
D
homozygous combination
Answer :
both homozygous and heterozygous states
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97.
Transgenic crops are modified through genetic engineering to develop natural resistance to insect pests. Which one is a transgenic plant
A
Tobacco and cotton
B
Tomato and rice
C
Maize and sugarcane
D
Tomato and wheat
Answer :
Tobacco and cotton
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98.
In Drosophila the XXY condition leads to female-ness whereas in human beings the same condition leads to Klienfelter's syndrome in male. It proves
A
In human beings Y chromosome is active in sex determination
B
Y chromosome is active in sex determination in both human beings and Drosophila
C
In Drosophila Y - chromosome decides femaleness
D
Y chromosome of man has genes for syndrome
Answer :
In human beings Y chromosome is active in sex determination
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99.
Which of the following statement is trte
A
Homo erectus is direct ancestor of Homo sapiens
B
Neanderthal man is direct ancestor of modm man
C
Australopithecus is direct ancestor of modern man
D
Fossils of Cromagnon man first found in uthopia
Answer :
Homo erectus is direct ancestor of Homo sapiens
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100.
If mendel has chosen to study traits determined by. linked genes he would not have discovered
A
Law of segregation
B
Law of dominance
C
Law of independant assortment
D
Law of unit character
Answer :
Law of independant assortment
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