221.
Mendel's Law is valid only when A
Two f! hybids are crossed
B
One parent is crossed with Fj hybrid
C
Two pure breeding contrasting characers are crossed
D
None of the above
Answer :
Two pure breeding contrasting characers are crossed
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222.
In Drosophila formation of gynandromorph and their cytological explaination provide best evidence that A
X-Chromosome plays important role in sex determination
B
X-Chromosome does not play any role in sex determination
C
Y-Chromosome does not play any role in sex determination
D
Y-Chromosome required for maleness
Answer :
Y-Chromosome does not play any role in sex determination
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223.
Mutagenic effect of X-rays was discovered by A
Muller
B
Luria
C
Morgan
D
De Vries
Answer :
Muller
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224.
In free martin condition A
Female is sterile and male is normal
B
Male sterile and female is normal
C
Both male and female are sterile
D
Both male and female normal
Answer :
Female is sterile and male is normal
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225.
In which ear life was absent A
Archaeozoic
B
Palaeozoic
C
Proterozoic
D
Azoic
Answer :
Azoic
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226.
If two persons with $$'AB'$$ blood group marry and have sufficiently large number of children these children could be classified as $$'A'$$ blood group: $$'AB'$$ blood group: $$'B'$$ blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both $$'A'$$ and $$'B'$$ type proteins in $$'AB'$$ blood group individuals. This is an example of: A
incomplete dominance
B
Partial dominance
C
Complete cominance
D
Codominance
Answer :
Codominance
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227.
The possible blood groups of children born to parents having A and AB groups are A
O, A
B
A, B, AB
C
O, A, B
D
O, A, B, AB
Answer :
A, B, AB
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228.
Which one of the following pairs of terms/names mean one and the same thing A
Gene pool - genome
B
Codon - gene
C
Cistron - triplet
D
DNA Fingerprinting - DNA profiling
Answer :
DNA Fingerprinting - DNA profiling
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229.
AB - Blood group shows A
Co-dominance
B
Complete dominance
C
Mixed inheritance
D
Composite inheritance
Answer :
Co-dominance
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230.
There are three genes a, b, c percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome A
B, a, c
B
A, b, c
C
A, c, b
D
None of the above
Answer :
B, a, c
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