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NEET UG Principles of Inheritance and Variation — practice questions — page 5

Explore 137 free Principles of Inheritance and Variation questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Principles of Inheritance and Variation questions and exercises with answers

Showing questions 121–137 of 137.

Colour blindness results from a defect in which part of the eye?Read the answer and worked solution →Why is a haemophilic female extremely rare?Read the answer and worked solution →Sickle-cell anaemia is inherited as which kind of trait?Read the answer and worked solution →At position six of the beta globin chain, sickle-cell anaemia replaces:Read the answer and worked solution →Which codon change in the beta globin gene causes sickle-cell anaemia?Read the answer and worked solution →In phenylketonuria, phenylalanine cannot be converted into:Read the answer and worked solution →The HBA1 and HBA2 genes of alpha thalassemia lie on which chromosome?Read the answer and worked solution →Gain or loss of a chromosome due to failed chromatid segregation is:Read the answer and worked solution →Down's syndrome is caused by trisomy of which chromosome?Read the answer and worked solution →Who first described Down's syndrome in 1866?Read the answer and worked solution →What is the karyotype of a person with Klinefelter's syndrome?Read the answer and worked solution →Gynaecomastia in an otherwise masculine individual is a sign of:Read the answer and worked solution →Which karyotype is found in Turner's syndrome?Read the answer and worked solution →How many chromosome combinations can independent assortment give a human gamete?Read the answer and worked solution →Mendel's study was the first in biology to apply which tools?Read the answer and worked solution →Pleiotropy in most cases arises from a gene's effect on:Read the answer and worked solution →Which genotype shows the sickle-cell trait but not the disease?Read the answer and worked solution →

Worked practice questions

Colour blindness results from a defect in which part of the eye?

  1. Lens of the eye
  2. Rod cells of retina
  3. Blue cones only
  4. Red or green cones
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Correct answer: D. Red or green cones

A faulty red or green cone stops the eye telling red from green.

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Why is a haemophilic female extremely rare?

  1. Females lack clotting factors
  2. Gene lies on the Y chromosome
  3. Gene is autosomal dominant
  4. Mother carrier and father affected
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Correct answer: D. Mother carrier and father affected

An affected female needs the X-linked recessive gene on both X chromosomes, from a carrier mother and a haemophilic father.

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Sickle-cell anaemia is inherited as which kind of trait?

  1. Autosomal dominant
  2. Y-linked inheritance
  3. Autosomal recessive
  4. X-linked recessive
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Correct answer: C. Autosomal recessive

The HbS gene is on an autosome and only HbS HbS individuals show the disease, so it is autosomal recessive.

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More Biology topics

Genetics and EvolutionReproduction in Organisms & PlantsBiotechnology and ApplicationsBiodiversity and ConservationThe Living World & Biological ClassificationNeural Control and Chemical CoordinationAnimal KingdomBiology in Human Welfare & Health