Principles of Inheritance and Variation
- A fruit fly is heterozygous for sex-linked genes. When mated with a normal female fruit fly, the male-specific chromosome will enter egg cells in the proportion of
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In sex determination, the male specific chromosome will have half as much chance as the other to enter the egg cell. Hence the proportion will be 1: 1.
Correct Option: A
In sex determination, the male specific chromosome will have half as much chance as the other to enter the egg cell. Hence the proportion will be 1: 1.
- Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase?
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Heterochromatin is a specialized chromosome material which remains tightly coiled and stains darkly in interphase. Euchromatin is that portion of the chromosome that stains with low intensity and uncoils during interphase. In the beginning of S-sphase, DNA replication occurs. DNA replication can occur in diffuse/ less tightly coiled euchromatin.
Correct Option: B
Heterochromatin is a specialized chromosome material which remains tightly coiled and stains darkly in interphase. Euchromatin is that portion of the chromosome that stains with low intensity and uncoils during interphase. In the beginning of S-sphase, DNA replication occurs. DNA replication can occur in diffuse/ less tightly coiled euchromatin.
- How many different types of genetically different gametes will be produced by a heterozygous plant having the genotype: AABbCc?
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Different types of gametes produced will be ABC, AbC, ABc, Abc
Correct Option: B
Different types of gametes produced will be ABC, AbC, ABc, Abc
- If Mendel had studied the 7 traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different?
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If Mendel had studied a plant with 12 chromosomes, he would have encountered linked genes, and hence he would not have arrived at principle of independent assortment
Correct Option: B
If Mendel had studied a plant with 12 chromosomes, he would have encountered linked genes, and hence he would not have arrived at principle of independent assortment
- How many genome types are present in a typical green plant cell?
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Three types of genome, occur in a typical green plant cell-nuclear genome, mitochondrial genome and chloroplast genome.
Correct Option: B
Three types of genome, occur in a typical green plant cell-nuclear genome, mitochondrial genome and chloroplast genome.
