A) Egg production only.
B) Sperm production only.
C) Either egg or sperm production.
D) Both egg and sperm production.
Correct Answer: A
Solution :
[a]Let allele for insulin like growth factor II is represented as\[I\]. | |||||||||
Genotype\[II\] = Normal size | |||||||||
Genotype \[ii\] = Dwarf | |||||||||
Cross 2 | |||||||||
Parents:\[ii\,\,\,\,\left( \operatorname{XX} \right)\times Ii\,\,\,\left( \operatorname{XY} \right)\] | |||||||||
Offspring: | |||||||||
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Parents: \[ii\,\,\left( \operatorname{XX} \right)\times Ii\,\left( \operatorname{XY} \right)\] | |||||||||
Offspring: | |||||||||
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From cross 2, normal mice appeared due to activation of allele\[I\]in the progeny received from male parent so normal \[Igf2\]gene did not get imprinted during sperm production. From cross 1, since some of the males were dwarfs heterozygous), so normal \[Igf2\]gene received from the female parent got imprinted during egg formation. |
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