NEET Zoology - MCQ Practice Questions

A frameshift mutation occurs in the middle of a gene. What is the most likely consequence?

Which of the following is the best evidence for evolution?

A new allele arises in a small island population of 100 individuals. The allele frequency is 0.02. Over the next 10 generations without selection, what is most likely to happen?

In a three-point testcross involving genes A, B, and C with map distances A-B = 10 map units and B-C = 20 map units, if coefficient of coincidence is 0.8, what is the interference value?

A researcher observes that in a population of snails, shell color is controlled by a single gene with two alleles (B and b). Yellow shells (BB) = 100, Brown shells (Bb) = 300, White shells (bb) = 600. Is this population in Hardy-Weinberg equilibrium?

Which of the following would NOT cause a change in allele frequencies in a population?

A species shows 5 pairs of chromosomes. During meiosis in an individual heterozygous for all 5 genes (AaBbCcDdEe), what is the maximum number of different gamete types that can be produced?

In a population affected by a recent bottleneck event, which is most likely to occur?

In Drosophila, the white eye mutation is X-linked recessive. If a heterozygous female is crossed with a normal male, what percentage of female offspring will have white eyes?

Which of the following represents the correct sequence of events during the evolution of a new species through allopatric speciation?

A population of 500 individuals has allele frequencies of A = 0.7 and a = 0.3. If the population follows Hardy-Weinberg equilibrium, what will be the frequency of heterozygotes in the next generation?

A silent mutation in the third codon position of a gene coding for protein synthesis most likely occurs due to:

In a testcross of a dihybrid (AaBb) with a homozygous recessive (aabb), if the offspring ratio deviates from 1:1:1:1, it indicates:

Peppered moths in industrial England showed rapid evolution from predominantly light-colored to dark-colored populations. This is an example of:

A mutation converts an amino acid codon (GUU for valine) to a stop codon (UAA). This type of mutation would most severely affect the protein by:

In a population of 1000 individuals, if a recessive genetic disorder appears in 16 individuals (aa genotype), and assuming Hardy-Weinberg equilibrium, what is the frequency of the recessive allele?

Homologous structures like bat wings, whale flippers, and human arms demonstrate evolutionary relationship through:

In a cross between two heterozygous individuals (Aa × Aa), if the homozygous dominant genotype (AA) is lethal and dies in utero, the surviving offspring ratio would be:

A researcher studying gene expression notices that identical twins show different phenotypes for a trait despite having identical genotypes. This is most likely due to:

In genomic imprinting, a disorder appears only when the mutant allele is inherited from the father but not the mother. This pattern suggests: