Top 150+ Solved Heredity and Variation MCQ Questions Answer

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Q. .Which one of the following conditions in human is correctly matched with its chromosomal abnormality / linkage ? AIPMT - 2008

a. Erythro blastosis foetalis - X - linked

b. Down's syndrome - 44 autosomes +XXY

c. Kline Felter's syndrome - 44 autosomes +XXY

d. Colour blindness - Y - linke

e. cessive

  • c. Kline Felter's syndrome - 44 autosomes +XXY

Q. .The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because "O" in it refers to having AIPMT - 2009

a. Overdominance of this type on the genes for A and B types

b. One antibody only - either anti - A or anti - B on the RBCs

c. no antigens A and B on RBCs

d. other antigens besides A and B on RBCs

e. cessive

  • c. no antigens A and B on RBCs

Q. . Sickle cell anemia is AIPMT - 2009

a. Caused by substitution of Valine by glutamic acid in the beta globin chain of haemo globin.

b. Caused by a change in a single base pair of DNA

c. Characterized by elongated sickle like RBCS with a nucleus

d. An autosomal dominant trait.

e. cessive

  • b. Caused by a change in a single base pair of DNA

Q. .Which one of the following can not be explained on the basis of Mendel's law of dominance? AIPMT - 2009

a. The discrete unit controlling a particular character is called a factor

b. Out of one pair of factors one is dominant, and the other recessive.

c. Alleles do not show any blending and both the characters recover as such in F2 generation.

d. Factors occur in pairs

e. cessive

  • c. Alleles do not show any blending and both the characters recover as such in F2 generation.

Q. . The genotype of a plant showing the dominatnt phenotype can be determined by AIPMT - 2010

a. test cross

b. dihybrid cross

c. pedigree analysis

d. Back Cross

e. cessive

  • a. test cross

Q. . Select the correct statement from the ones given below with respect to dihybrid cross.

a. Tightly linked genes on the same chromosomes show higher recombinations

b. Genes far apart on the same chromosome show very few recombinations

c. Genes loosely linked on the same chrososome show similar recombinations

d. Tightly linked genes on the samechromosome show very few recombinations

e. cessive

  • d. Tightly linked genes on the samechromosome show very few recombinations

Q. Which one of the following symbols and its representation used in human pedigree analysis is correct? AIPMT - 2010

a. = Mating between relatives

b. = unaffected male

c. = unaffected female

d. = affected male

e. cessive

  • a. = Mating between relatives

Q. Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character

a. The female parent is heterozygous

b. The parent could not have had a normal daughter for this character

c. The trait under study could not be colourblindness

d. The male parent is homozygous dominant

e. cessive

  • a. The female parent is heterozygous

Q. Which one of the following conditions correctly describes the manner of determining the sex? AIPMT - 2011

a. Homozygous sex chromosomes (ZZ) determine female sex in birds

b. XO type of sex chromosomes determine male sex in grasshopper

c. XO condition in humans as found in Turner's syndrome, determines female sex

d. Homozygous sex chromosomes (XX) produce male in Drosophila

e. cessive

  • b. XO type of sex chromosomes determine male sex in grasshopper

Q. Mutations can be induced with AIPMT - 2011

a. Infra red radiations

b. IAA

c. Ethylene

d. gamma radiations

e. cessive

  • d. gamma radiations

Q. Test cross in plants or in Drosophilia involves crossing AIPMT - 2011

a. between two genotype with recessive trait

b. between two F1 hybrids

c. the F1 hybrid with a double recessive genotype

d. between two genotypes with dominant traits

e. cessive

  • c. the F1 hybrid with a double recessive genotype

Q. Which one of the following conditions of the Zygotic cell would lead to the birth of a normal human female child? AIPMT - 2011

a. Two X Chromosomes

b. Only One Y Chromosomes

c. Only One X Chromosomes

d. One X chromosome and One Y chromosome

e. cessive

  • a. Two X Chromosomes

Q. F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1 . It represents in case of AIPMT - 2012

a. Co - Dominance

b. Dihybrid Cross

c. Monohybrid cross with complete dominance

d. Monohybrid cross with incomplete dominance

e. cessive

  • d. Monohybrid cross with incomplete dominance
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