NEET Zoology - MCQ Practice Questions

A patient develops Cushing's syndrome due to excessive cortisol. Which feedback mechanism is disrupted?

Which of the following best explains oxygen-hemoglobin dissociation curve shift to the RIGHT?

A person injures their spinal cord at the cervical level. Which of the following would NOT be affected?

A researcher observes that blocking acetylcholinesterase leads to prolonged muscle contraction. This demonstrates that acetylcholinesterase's role is to:

In a diabetic patient with hyperglycemia, which of the following best explains why glucose appears in urine?

Which neural pathway transmits pain and temperature sensation from the body to the brain?

A marathon runner experiences muscle cramps after 2 hours of intense exercise despite adequate hydration. Analysis shows normal blood glucose and electrolyte levels. Which physiological mechanism most likely explains this condition?

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?