NEET Zoology - MCQ Practice Questions

A cross between a homozygous tall plant (TT) and homozygous dwarf plant (tt) produces F1 generation. When F1 is self-pollinated, the ratio of tall to dwarf plants in F2 will be:

In Drosophila, white eye color (w) is X-linked recessive. A white-eyed female (XwXw) is crossed with a red-eyed male (XW Y). What percentage of offspring will have white eyes?

Which of the following represents a point mutation that does NOT change the amino acid sequence of a protein?

A man with blood group AB marries a woman with blood group O. Their children will have blood groups:

According to Hardy-Weinberg equilibrium, if the frequency of allele 'A' is 0.6 and allele 'a' is 0.4 in a population, what will be the frequency of heterozygotes (Aa)?

Which of the following evolutionary evidences is based on the study of vestigial structures like human tailbone and wisdom teeth?

In pea plants, yellow seed (Y) is dominant over green (y). If a cross produces 75% yellow and 25% green seeds, what was the genotype of the parents?

A homozygous round seed pea plant (RR) is crossed with homozygous wrinkled seed plant (rr). The F1 seeds are planted and self-pollinated. In the F2 generation, what fraction of round seed plants will be homozygous?

Which mechanism of evolution is responsible for random changes in allele frequencies in small populations?

A couple plans to have children. The man is a carrier for cystic fibrosis (Aa) and the woman is homozygous normal (AA). What is the probability their child will have cystic fibrosis?

The peppered moth experiment by Kettlewell during industrial revolution demonstrated which evolutionary concept?

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?

A red-eyed Drosophila female (XW) is crossed with a white-eyed male (XwY). What will be the phenotypes of F1 offspring?

The concept of 'survival of the fittest' in evolution primarily refers to:

A testcross of a tall plant with unknown genotype produces 50% tall and 50% dwarf offspring. The tall parent's genotype must be:

Homologous structures in different species indicate:

In ABO blood group genetics, if both parents have AB blood group, what blood groups are IMPOSSIBLE in their children?

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?