Category: CSIR NET Life Science Previous Year Questions and Solution on MENDELIAN PRINCIPLES

Category: CSIR NET Life Science Previous Year Questions and Solution on MENDELIAN PRINCIPLES

CSIR NET Life Science Previous Year Questions and Solution on MENDELIAN PRINCIPLES

36. In summer squash, white colour fruit (W) is dominant over yellow colour (w) and disc-shaped phenotype (D) is dominant over sphere-shaped phenotype (d). Determine the genotype of the parents if the cross between white, sphere crossed with white, sphere gives 1/4 white, sphere and 14 yellow, Sphere. (1) WWDD X wwdd (2) Wwdd X Wwdd (3) WwDd X wwdd (4) WWDD x WWdd

Genotypes of white, sphere summer squash parents producing 1/4 white, 1/4 yellow sphere fruits

35. A phenotypically normal fruit fly was crossed to another fly whose phenotype was not recorded. Of the progeny, 3/8 were wild type, 3/8 had ebony body color, 1/8 had vestigeal wings and 1/8 had ebony body color and vestigeal wings. Ebony body color and vestigeal wings are recessive characters and their genes are located on two different autosomes. Based on this information which one of the following is the likely genotype of the parents? (1) ee vg vg and e+e+ vg+vg (2) ee vg+vg and e+e vg+vg (3) e+e vg vg and e+e+ vg+vg (4) e+e vg+vg and ee vg+vg

Determining parental genotypes from Drosophila progeny ratios (ebony and vestigial)

34. Mendel crossed tall pea plants with dwarf ones. The F1 plants were all tall. When these F1 plants were selfed to produce F2 generation, he got a 3: 1 tall to dwarf ratio in the offspring. What is the probability that out of three plants (of F2 generation) picked up at random two would be dwarf and one would be tall? (1) 3/4 (2) 3/8 (3) 9/64 (4) 9/32

Probability that three F₂ pea plants are two dwarf and one tall

33. Assuming a 1 : 1 sex ratio. what is the probability that three children from the same parents will consist of two daughters and one son? (1) 0.375 (2) 0.125 (3) 0.675 (4) 0.75

Probability that three children are two daughters and one son (1:1 sex ratio)

32. In a plant, male sterility is caused by the presence of a dominant allele for a nuclear gene (Ms). There are also lines which carry a gene whose dominant allele (F) restores male fertility. These are called restorer lines. A cross is made between a male sterile line and a homozygous restorer line which does not contain the Ms allele. Of the Fl progeny, only those that carry the Ms allele are allowed to self-pollinate. What is the probability of obtainjng a male sterile line in the resulting progeny? (The Ms and F genes assort independently), (1) 1/4 (2) 3/16 (3) 3/4 (4) 1/16

Probability of recovering a male‑sterile line when Ms and F assort independently

31. A plant of the genotype AaBb is selfed. The two genes are linked and are 50 map units apart. What proportion of the progeny will haw the genotype aabb? (1) 1/2 (2) 1/4 (3) 1/8 (4) 1/16

Proportion of aabb progeny when AaBb (50 map units apart) is selfed

30. How many genetically different gametes can be made by an individual of genotype AaBbccDDEe? (1) 3 (2) 5 (3) 1/4 (4) 32

How many different gametes can AaBbccDDEe produce?

29. Assuming that the A, B, C and D genes are not linked. The probability of a progeny being AaBBccDd from a corss between AABbccDd and aaBBccDD parents will be (1) 4/32 (2) 3/16 (3) 1/4 (4) 3/32

Probability of getting AaBBccDd from AABbccDd × aaBBccDD

28. In the following example, 3 independently assorting genes are known to govern coat color in mice. The genotype of few of the coat colors is given below: Agouti: A-B-C- Black: aa B-C- Albino: -- -- cc What will be the expected frequency of abino, in the F2 progeny from crosses of pure black with albino of the genotype AAbbcc? (1) 1/4 (2) 1/16 (3) 1/64 (4) 9/64

Calculating albino frequency in F₂ from black × albino (AAbbcc) mice

27. Genes A, B and C. control three phenotypes which assort independently; A plant with the genotype Aa Bb Cc is selfed. What is the probability for progeny which show the dominant phenotype for AT LEAST ONE of the phenotypes controlled by genes A, B and C? (1) 1/64 (2) 27/64 (3) 63/64 (4) Cannot be predicted

Probability of at least one dominant phenotype in selfed AaBbCc plant

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Probability of getting a sum of 9 when two dice are thrown

25. Two strains of mice which are genetically identical except for a Single genetic locus or region are said to be: (1) Syngenic (2) Allogenic (3) Congenic (4) Heterogenic

What are mouse strains that differ at only one genetic locus called?

23. Mutation is essential for genetic variation. Which one of the following events can lead to variation amongst the gametes produced by males of Drosophila melanogaster? [Crossing over does not occur in D. melanogaster males] (1) Segregation (2) Imprinting (3) Recombination (4) Independent Assortment.

How Drosophila males generate genetically different gametes without crossing over

22. Two siblings who inherit 50% of the genome from the mother and 50% from the father show lot of phenotypic differences. Which one of the following events during gametogenesis of the parents will maximally contribute to this difference? (1) Mutation (2) Recombination (3) Independent assortment (4) Environment

Why recombination makes siblings so different

21. Which of the following representations of chromosomal arrangement in meiotic metaphase I best explains the Law of Independent Assortment?

Metaphase I arrangement that best explains the law of independent assortment

20. If all four gametes AB, aB, Ab and ab are formed in equal probability. Then arrangement of chromosomes at metaphase-I of meiosis will be

Chromosome arrangement at metaphase I when gametes AB, Ab, aB, ab occur equally

19. In a heterozygous individual for a given gene, if a crossing over has occurred between the gene locus and the centromere of the chromosome, the segregation of the two alleles of the given gene will occur during meiosis at (1) either anaphase I or anaphase II (2) anaphase I only (3) anaphase II only (4) both anaphase I and II

When do alleles segregate if crossing over occurs between gene and centromere?

18. In Drosophila males, where no recombination occurs, segregation of the two alleles of a gene occurs at which stage of cell division? (1) Diplotene (2) Anaphase I (3) Anaphase II (4) Mitotic Telophase

Stage of allele segregation in Drosophila male meiosis without recombination

17. In Drosophila melanogaster males, homologous chromosomes pair and segregate during meiosis but crossing over does not occur. At which stage of meiosis does segregation of 2 alleles of a gene take place in these individuals? (1) Zygotene (2) Diakinesis (3) Anaphase I (4) Anaphase II

Stage of allele segregation in Drosophila male meiosis without crossing over

16. A cross made between a pure breeding plant having red coloured flowers with a pure breeding plant having white coloured flowers. Such a cross is called as (1) test cross. (2) monohybrid cross. (3) dihybrid cross. (4) back cross.

What do you call a cross between pure-breeding red and white flower plants?

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Phenotypes after selfing all F2 round seeds from a 3:1 Mendelian cross

14. During gamete formation, if there is no crossing over, the pair of alleles segregates during (1) Meiosis-I (2) Meiosis-II (3) Mitosis (4) Cleavage

At which division do alleles segregate when no crossing over occurs?

Probability of getting AABB from selfed AaBb plant

12. The Mendelian law of Independent assortment is due to arrangement of chromosome during (1) Metaphase-I (2) Anaphase-I (3) Metaphase-II (4) Anaphase-II

Why independent assortment is tied to metaphase I of meiosis

11. Possible types of gametes formation from genotype AABBCcDdEe would be- (1) 16 (2) 64 (3) 8 (4) 128

How many gametes from genotype AABBCcDdEe?

10. Possible combination of gametes which can be formed by genotype AaBbCcDdEeFfGg are? (1) 16 (2) 32 (3) 64 (4) 128

How many gametes from genotype AaBbCcDdEeFfGg?

9. In test cross, F1 progeny is crossed with (1) Either of the parent (2) Recessive parent (3) Dominant parent (4) Heterozygous parent

What is crossed in a genetic test cross?

8. All of the mendelian alleles for different trait showed (1) Epitasis (2) Co-dominance (3) Incomplete dominance (4) Dominance and recessiveness

What pattern do Mendelian alleles show?

7. Typical mendelian dihybrid ratio for F2 generation is- (1) 9:3:3:1 (2) 9:7 (3) 1:2:1 (4) 9:7

Typical Mendelian dihybrid F2 ratio

6. Mendel’s laws of inheritance is applicable to- (1) Nuclear genes (2) Plasmid genes (3) Mitochondrial genes (4) Plastid genes

Why Mendel’s laws apply mainly to nuclear genes

5. A Rh + ve male marries a Rh-ve female, their progenies will be- (1) Rh +ve only (2) Rh -ve only (3) Can be Rh +ve or –ve (4) Cannot be predicted

Rh-positive father × Rh-negative mother: what Rh type can the children have?

4. When dominant purple color flower (PP) are crossed with recessive white (pp), then the progenies will have the ratio of Purple: White is (1) 1:2:1 (2) 3:1 (3) All purple (4) 2:2

Phenotypic ratio in a PP × pp monohybrid cross

3. If P is for purple (dominant) and p for red (recessive) and L for wide leaf (dominant) and l for narrow leaf (recessive). When a cross is made between PpLl X PpLl, in 250 plants number of red plants with wide leaf approximately will be (1) 4 (2) 10 (3) 25 (4) 50

Calculating number of red, wide-leaf plants in a PpLl × PpLl dihybrid cross

2.Mendel's monohybrid ratio is outcome of (1) Independent assortment of genes (2) Hardy-Weinberg law (3) Uncontrolled matting (4) Separation of homologous chromosomes during meiosis

Why Mendel’s monohybrid 3:1 ratio comes from chromosome separation in meiosis

1. When a F1 generation of a monohybrid cross is allowed self-fertilize, the expected phenotypic ratio is (1) 2:1 (2) 3:1 (3) 4:1 (4) 3:4

Phenotypic ratio in the F2 generation of a monohybrid cross

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