NEET Zoology - MCQ Practice Questions

A population of beetles shows variation in shell color. After a pesticide treatment, dark-colored beetles survive better. This is an example of:

In a gene pool of 500 individuals with allele frequencies p = 0.7 and q = 0.3, how many heterozygous individuals are expected according to Hardy-Weinberg principle?

In a population of 10,000 individuals, if the frequency of recessive allele 'a' is 0.1, how many individuals would be expected to have the dominant phenotype?

Which of the following mutations would most likely be lethal?

Which of the following best explains why antibiotic-resistant bacteria increase in a population after antibiotic exposure?

If a woman with normal vision (but carrier for color blindness) has children with a color-blind man, what percentage of their daughters are expected to have normal vision?

In a population of 50,000 individuals, if 400 individuals show a recessive trait, calculate the frequency of the dominant allele (assuming Hardy-Weinberg equilibrium).

Gene flow between two populations can prevent genetic drift from causing fixation of alleles because:

A three-point testcross in Drosophila yields recombinant classes with lower frequencies than parental classes. This demonstrates:

A lethal allele that causes embryonic death in homozygous condition would alter the expected dihybrid ratio from 9:3:3:1 to:

In humans, if both parents are heterozygous carriers of sickle cell anemia (HbAS), what is the probability of their child being completely unaffected?

The concept of 'adaptive radiation' is best exemplified by:

A population experiences a bottleneck reducing its size from 10,000 to 100 individuals. Which evolutionary consequence is MOST likely?

In a X-linked trait, if the allele frequency of the recessive allele in males is 0.1, what is the allele frequency of the recessive allele in females at Hardy-Weinberg equilibrium?

A mutation changes a GC base pair to AT in a non-coding region of DNA. This mutation's evolutionary significance depends primarily on:

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?