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Biology Objective Questions and Answers for Competitive Examinations

Questions
41 The grouping of human chromosomes is based on
A Secondary constrictions alone
B Dot like satellites alone
C Banding pattern alone
D All the above

Answer: Option [C]

The grouping of human chromosomes is based on Banding pattern alone.

42 The gene which increases the frequency of mutation in other is referred to as
A Mutator gene
B Mutagene
C Hypostatic gene
D Complementary gene

Answer: Option [A]

The gene which increases the frequency of mutation in other is referred to as Mutator gene. The gene increasing the frequency of mutations in other genes is mutagene. A gene that masks the phenotypic effect of another gene is called as an epistatic gene; the gene it subordinates is the hypostatic gene.

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43 Two allelic genes are located on
A The same chromosomes
B Two homologous chromosomes
C Two non-homologous chromosomes
D Any two chromosomes

Answer: Option [B]

Two allelic genes are located on two homologous chromosomes. An allele is a two form of a gene which carries the contrasting characters. In a diploid organism, one that has two copies of each chromosome, two alleles make up the individual's genotype. Two allelic genes are located on two homologous chromosomes.

44 The frequency of an allele in an isolated population may change due to
A gene flow
B mutation
C genetic drift
D natural selection

Answer: Option [C]

The frequency of an allele in an isolated population may change due to genetic drift. Genetic drift is also called as allelic drift. It is the change in the frequency of a gene variant in a population due to random sampling. It thus results in a change of frequency of an allele in an isolated population.

45 Number of autosmes in human sperm is
A 11
B 22
C 44
D 45

Answer: Option [B]

Number of autosmes in human sperm is 22. Sperm cells are haploid in nature. They contain 22 chromosomes which are autosomes. They do contain sex chromosome, X or Y in human sperm.

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