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

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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