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MHT-CET Principles of Inheritance and Variation — practice questions — page 2

Explore 90 free Principles of Inheritance and Variation questions in MHT-CET 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 31–60 of 90.

Polygenic traits such as human height are controlled by:Read the answer and worked solution →Which is a classic example of a polygenic trait in humans?Read the answer and worked solution →If genes A, B and C set skin colour additively, what colour is AaBbCc?Read the answer and worked solution →A single gene that shows several phenotypic effects is called:Read the answer and worked solution →Phenylketonuria results from a mutation in the gene for which enzyme?Read the answer and worked solution →Grasshoppers show which type of sex determination?Read the answer and worked solution →In humans and Drosophila, the male sex chromosome makeup is:Read the answer and worked solution →In humans, the sex of the child is decided by the genetic makeup of:Read the answer and worked solution →How many chromosomes does a male honey bee (drone) have?Read the answer and worked solution →Male honey bees produce sperms by which type of division?Read the answer and worked solution →A change in a single base pair of DNA is called a:Read the answer and worked solution →Studying how a trait passes through generations of a family is called:Read the answer and worked solution →Mendelian disorders are mainly caused by:Read the answer and worked solution →Which of these is NOT a Mendelian disorder?Read the answer and worked solution →Red-green colour blindness occurs in about what share of males?Read the answer and worked solution →A carrier woman's son has what chance of being colour blind?Read the answer and worked solution →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 →

Worked practice questions

Polygenic traits such as human height are controlled by:

  1. A single gene only
  2. Two alleles of a gene
  3. Genes on the Y only
  4. Three or more genes
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Correct answer: D. Three or more genes

Traits spread across a gradient are usually governed by three or more genes.

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Which is a classic example of a polygenic trait in humans?

  1. ABO blood group
  2. Pea flower colour
  3. Human skin colour
  4. Sickle-cell anaemia
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Correct answer: C. Human skin colour

Human skin colour depends on several genes plus environment and varies continuously.

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If genes A, B and C set skin colour additively, what colour is AaBbCc?

  1. Darkest skin colour
  2. Lightest skin colour
  3. Intermediate skin colour
  4. Very dark skin colour
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Correct answer: C. Intermediate skin colour

AaBbCc has three dominant and three recessive alleles, so its additive effect gives an intermediate shade.

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