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Principles of Inheritance and Variation — NEET UG Biology PYQs

58 previous year questions from Principles of Inheritance and Variation with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

58 questionsBiologySolutions on every page
1

Point mutation is __________

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Choose the group of correct statements regarding sex-linked inheritance. A) Y-linked genes are inherited only in males. B) X-linked genes are inherited only in females. C) Colourbl

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How many pair/s of contrasting characters in the pod of pea were considered by Mendel in his experiments?

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Development of feminine characters and no spermatogenesis are characteristic feature of people with __________.

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According to Mendel, a gamete generally contains __________.

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The number of linkage groups of a particular species corresponds to its _________ number of chromosomes.

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A man, homozygous dominant for widows peak (WW), marries a woman with straight hairline homozygous recessive (ww). How many of their off springs will inherit straight hair line?

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Extra copy of 21st chromosome causes _________ in human.

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Linkage of genes in plants was discovered by ________ .

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Match types of variation in column I with their causes in column II. Select the correct option. Column I Column II A. Gene mutation I. occurs due to crossing over B. Gene recombina

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Which one of the following does NOT show non-allelic interaction?

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With respect to a specific genus and its species, a monohybrid cross is a cross between________.

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Female gametes in a plant have genotypes TR, Tr, tR and tr with respect to height (T/t) and flower colour. (R/r). What will be the phenotype of this plant?

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In a typical monohybrid, a cross with respect to a certain trait, 120 plants are obtained in the F₂ generation. What will be the approximate number of homozygous and heterozygous p

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The genes located on homologous regions of X and Y chromosomes do not inherit together because crossing over occurs in this region. Thus, they exhibit incomplete sex linkage. They

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Match the disorders in List I with their causes in List II and choose the correct option. List I List II (A) Thalassemia. (I) non-disjunction of sex chromosomes. (B) Sickle-cell an

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With respect to Sex determination pattern in Birds which of the following statement is true?

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Given below are two statements. Statement I - Only males can suffer from haemophilia. Statement II - The gene for normal clotting of blood in human is recessive. In the light of ab

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Identify the chromosomal aberration from the given diagram

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A cross between two plants resulted in the formation of tall and dwarf offsprings in the ratio of 3:1. The genotypes of their parents will be __________.

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Which one of the following characters does NOT belong to Down's Syndrome?

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Match the phenomenon in Column I with the Scientist who suggested it in Column II Column I (Phenomenon) Column II (Scientist) (A) Linkage (I) Sutton and Boveri (B) Chromosomes (II)

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Which type of sex determination is seen in honey bees?

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Deficiency of clotting factor VIII or IX in the blood causes _________.

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Hypertrichosis is _____________ character.

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Match List I with List II List I Types of gene interaction. List II Examples. (A). Pleiotropy (I). Mirabilis jalapa (B). Codominance (II). ABO blood group (C). Incomplete dominance

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Which of the following statements are CORRECT? Statement (I): Thalassemia is an autosomal, inherited recessive disease. Statement (II): Haemoglobin molecule is made up of four poly

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Study the following statements and select the correct option: Statement (I): Examples of Mendelian disorders are Turner's syndrome and Down's syndrome. Statement (II): Mendelian di

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A sickle-cell carrier man marries a woman who is carrier for sickle-cell anaemia. What are the chances of having carrier children?

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In a population with two alleles B and b with frequency 0.6 and 0.4 in Hardy-Weinberg equillibrium. How many heterozygous individuals in a sample of 250 can be expected?

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A pea plant with genotype RrYy is crossed with another pea plant with genotype rryy. What will be the number of phenotypes obtained by this cross?

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Which one of the following is a symptom of Klinefelter's Syndrome?

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A normal woman whose father was colourblind is married to a normal man, (assuming equal distribution of female gametes), then _________.

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In the F₂ generation, the genotypic and phenotypic ratios are identical in ____.

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In X and Y chromosomes, crossing over occurs only between ____.

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How many of the following statements are correct about Mendelian alleles? (A). The dominant allele expresses itself in the presence of an alternative allele. (B). The recessive all

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Which one of the following could NOT be the genotypes of the parents of a child with the blood group "O" Rh ^ +ve ?

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Which one of the following crosses will have all the offsprings with recessive phenotype in the F₂ generation?

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In sickle cell anemia, the carrier (heterozygous) individuals can be identified by the microscopic examination of ____ cells.

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Which one of the following disorder shows symptoms of excess of phenylalanine in urine of humans?

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Match List I with List II List I (Genetic disorders) List II (Type) (A). Thalassemia (I). X-monosomy (B). Turner's syndrome (II). Extra X-chromosome (C). Klinefelter's syndrome (II

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Identify the INCORRECT statement about red-green color blindness in human.

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Morgan carried out several dihybrid crosses in Drosophila . Which one of the following crosses helped him find the sex-linked inheritance?

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Match List I with List II List I (Gene interaction) List II (Examples) (A). Holandric genes (I). Multiple effects of a single gene (B). Pleiotropy (II). Hypertrichosis (C). Multipl

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In a cross between a pure tall pea plant with yellow pod and a pure short plant with green pod, how many double recessive plants would you expect in F₂ generation?

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Study the following statements. (A). Due to incomplete linkage the parental traits are inherited in offsprings. (B). Due to incomplete linkage new traits occur in offsprings. (C).

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Girl of normal vision whose father was colorblind marries a man of normal vision whose father was also colourblind. The sons of this marriage would be

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How many of the following genotypes are representing tall plants with round seeds? TTrr, Ttrr, TtRr, TTRr, ttrr, TtRR

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Which one of the following is a mismatch?

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Match List I with List II List I (Organism) List II (Chromosome number) (A). Mus musculus (I). 01 (B). Homo sapiens (II). 10 (C). Arabidopsis thaliana (III). 40 (D). E. coli (IV).

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Read the following statement with respect to Phenylketonuria (PKU) and select the correct option. (A). It is an inborn disorder caused due to dominant gene. (B). When recessive gen

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In mutation breeding, which of the following does NOT represent chemical mutagens?

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Linkage of genes in plants was discovered by -----------------.

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Which one of the following is NOT an example of complete sex linkage ?

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In a monohybrid cross between pure tall pea plant with pure dwarf pea plant, how many types of genotypes are found in the F₂ generation ?

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Match List I with List II List I (Organisms) List II (Chromosome number) (A). Roundworm (I). 40 (B). Mouse (II). 32 (C). Fruit fly (III). 12 (D). Yeast (IV). 8 Choose the correct a

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Which one of the following is NOT a symptom of Turner's syndrome ?

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The daughter of a colour- blind father and a normal mother marries a normal male. What percentage of male children of this couple will be colour -blind ?

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