NEET UG Principles of Inheritance and Variation — practice questions
117 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Principles of Inheritance and Variation in the app →Mendel conducted his hybridisation experiments on which plant?Mendel selected pea plants with how many pairs of contrasting traits?In Mendel's monohybrid cross between true-breeding tall (TT) and dwarf (tt) plants, the F₂ phenotypic ratio waThe F₂ **genotypic** ratio in Mendel's monohybrid cross is:A test cross in Mendelian genetics is performed by crossing an organism with the dominant phenotype with:The Punnett square is used to:Mendel's Law of Segregation states that:Mendel's Law of Independent Assortment is best illustrated by the F₂ phenotypic ratio of:Mendel's Law of Independent Assortment applies only when:
In In ABO blood grouping, the I^A and I^B alleles are:The ABO blood-group gene (I) has how many alleles in the human population?A person with blood group AB has the genotype:A person with blood group O has the genotype:Thomas Hunt Morgan used which model organism for his genetic studies?In Morgan's data, the genes white and yellow showed only 1.3% recombination, while white and miniature wing shWhich of the following is a characteristic of polygenic inheritance?In humans, the sex-determination mechanism is:In grasshopper, the sex-determination mechanism is:In birds, the sex-determination mechanism is:The probability of giving birth to a male or female child in humans is:Sickle-cell anaemia is caused by:Which of the following is a mutagen?Sickle-cell anaemia is a:Thalassemia differs from sickle-cell anaemia in that:β-Thalassemia is controlled by which gene?Down's syndrome is caused by:Klinefelter's syndrome is characterised by the karyotype:Turner's syndrome results from the karyotype:Aneuploidy refers to:Polyploidy refers to:In a monohybrid cross Tt × Tt, the phenotypic ratio in F2 is:Genotypic ratio of a monohybrid F2 (Tt × Tt):Phenotypic ratio in dihybrid F2 cross (RrYy × RrYy):ABO blood groups: an individual with genotype I^A i has blood type:Refer to the Punnett square shown for monohybrid cross:
 is dominant over blue (b). Bb father × bb mother. Probability of blue-eyed child:In a pedigree, a horizontal line connecting two individuals represents:Pleiotropy refers to:4 O'clock plant flower color shows incomplete dominance: RR (red) × rr (white) → Rr (pink). F2 phenotypic ratiLinkage map distance of 1 cM (centimorgan) corresponds to:In Mendel's monohybrid cross of tall × dwarf pea plants, the phenotypic ratio in the F₂ generation wasA tall pea plant is crossed with a dwarf plant. Half the offspring are tall and half are dwarf. The genotype oThe genotypic ratio in the F₂ of a monohybrid cross between Tt × Tt isA cross between true-breeding red (RR) and true-breeding white (rr) snapdragons gives pink F₁ plants. This patA person with blood group AB has genotypeThe ABO blood-group system is an example ofThe phenotypic ratio in the F₂ of a Mendelian dihybrid cross (with two independently assorting genes) isMendel's Law of Independent Assortment is best illustrated by the F₂ ratioMorgan's discovery of linkage in Drosophila showed thatIf two genes on the same chromosome show a recombination frequency of 1%, they are approximatelyA trait controlled by three or more genes whose effects add up, producing a continuous range of phenotypes, isIn humans, the sex of a child is determined at fertilisation byIn honey bees, drones (male bees) develop fromHaemophilia and colour blindness are inherited asIn Mendel's monohybrid cross between tall (TT) and dwarf (tt) pea plants, what is the phenotypic ratio observeA cross used to determine the genotype of an organism showing a dominant phenotype is called a:In a typical Mendelian dihybrid cross of two heterozygous parents (RrYy x RrYy), what phenotypic ratio appearsWhich type of sex determination is found in human beings?Down's syndrome is caused by:Haemophilia in humans is inherited as:In Antirrhinum, a cross between true-breeding red (RR) and white (rr) flowered plants produces pink (Rr) F1 plHow many distinct genotypes are possible for the human ABO blood group system, which is controlled by three alPhenylketonuria is cited in NCERT as an example of pleiotropy because:Which insect group shows XO type of sex determination, where males have one X chromosome and females have two?In which group is the female the heterogametic sex, producing two kinds of gametes with respect to sex chromosKlinefelter's syndrome in humans corresponds to which karyotype?Turner's syndrome in human females is caused by:Human skin colour is described in NCERT as a polygenic trait because:Thomas Hunt Morgan worked extensively with which organism to establish the chromosomal theory of inheritance aA heterozygous yellow round seeded pea plant (YyRr) is test crossed with a green wrinkled seeded plant (yyrr).A man of blood group AB marries a woman of blood group O. What blood groups can their children possibly show?A phenotypically normal woman whose father was haemophilic marries a normal non-haemophilic man. What proportiIn sickle-cell anaemia the mutation substitutes which amino acid in the beta chain of haemoglobin?Two parents who are both heterozygous carriers of sickle-cell anaemia (Hb^A Hb^S) plan a child. What is the prA colour-blind man marries a woman whose father was colour-blind but whose mother had no family history of theIn a snapdragon cross, two pink-flowered (Rr) plants are crossed. What fraction of the F1 offspring is expecteIn Drosophila, Morgan found that the genes white (w) and yellow (y) showed only 1.3 per cent recombination, whIn Drosophila melanogaster, a normal female and a normal male respectively carry which sex chromosome compositMendel's law of independent assortment is best illustrated by which observation?A substitution of a single base pair in the DNA that alters a single amino acid in the resulting protein is clDuring spermatogenesis in human males, what proportion of sperm carries the Y chromosome, and what does this iIf skin colour is determined by three genes A, B and C with additive dominant alleles, two parents of genotypeFailure of segregation of chromatids during cell division, leading to gain or loss of a single chromosome, is In a dihybrid cross between two heterozygous individuals (YyRr x YyRr) following independent assortment, what Mendel conducted his classic genetics experiments using:In a monohybrid cross of Tt × Tt, the F2 PHENOTYPIC ratio is:In a DIHYBRID cross of YyRr × YyRr, the F2 phenotypic ratio is:In snapdragon (Antirrhinum), RR (red) × rr (white) gives F1 plants that are PINK. This pattern is called:In the human ABO blood group system, a person with blood group AB has the genotype:The sex of a human baby is determined by:Sickle cell anaemia is caused by:Down syndrome is most commonly caused by:Haemophilia and colour blindness are MORE COMMON in MALES than females because they are:Mendel carried out his hybridisation experiments on:Mendel's experiments on peas ran for how many years?Mendel's work first applied to biology the tools of:Mendel's data carried greater credibility because his samples were:Mendel chose characters that showed how many opposing traits?A line showing stable trait expression over generations is called:How many true-breeding pea varieties did Mendel select?Which pair of seed traits did Mendel study?The diagram used to work out cross outcomes is the:The Punnett square was developed by a geneticist from:The Punnett square calculates the probability of possible:In a monohybrid cross, the phenotypic ratio at F2 is:In that same cross, the genotypic ratio at F2 is:By the law of dominance, characters are controlled by units called:Mendel stated that these factors occur in:In a dissimilar pair of factors, the one expressed is called:The factor not expressed in a dissimilar pair is called:The law of segregation rests on the fact that alleles show no:During gamete formation, a gamete receives how many of the two factors?A homozygous parent produces gametes that are all:A heterozygous parent produces how many kinds of gamete?The phenotypic ratio from a dihybrid cross is: