Principles of Fish Genetics & Breeding

1

The shortest phase of mitosis is

Classical Genetics Classical Genetics ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

2

If 20% of heterozygous polydactyly (Pp) do not show polydactyly, the gene has a penetrance of

Classical Genetics Classical Genetics ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

3

Genetic interactions may also occur without epistasis if the end products of different pathways each contribute to same trait This phenomenon is referred to as

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4

‘Which of the following functions is not performed by epithelial 2° circulation in fish?

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5

An allele that is very common in a population is reffered to as

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6

The square method in genetics to determine phenotypic or genotypic combinations in crosses is named after its inventor called

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7

If the dominant alleles of both loci each produce the same phenotype without cumulative effect, the classical dihybrid ratio is modified as:

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8

If 54 mutations are detected among 723 progeny of males that received 2500 roentgens and 78 mutation among 649 progeny of males that received 4000 roentgens, how many mutants would be expected to appear among 1000 progeny of males that received 6000 roentgens.

Chromosomal Aberrations, Aneuploidy , Polyplo Chromosomal Aberrations, Aneuploidy , Polyplo ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

9

Asecond mutation at a different location in the genome , which compensates for the effect of the first mutation is

Chromosomal Aberrations, Aneuploidy , Polyplo Chromosomal Aberrations, Aneuploidy , Polyplo ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

10

Mosaicism is a term used in

Chromosomal Aberrations, Aneuploidy , Polyplo Chromosomal Aberrations, Aneuploidy , Polyplo ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

11

Nullisomy is represented by

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12

Some genes that increase the mutation rate of another locus are referred to as

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13

Aclastogenic compound is one that

Chromosomal Aberrations, Aneuploidy , Polyplo Chromosomal Aberrations, Aneuploidy , Polyplo ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

14

Cryopreservation of eggs and embryos of fish has been reported with less success. The main reasons are believed to be —

(A) . Large yolk sac

(B) . Large egg volume

(C) . Chorion

(D) . Chorionic membrane

Chromosome Manipulation Chromosome Manipulation ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

15

Which of the following species naturally spawn in Spring and Autumn?

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16

Which fish secrete thread-like substances from their kidney on which eggs remain attached?

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17

Which of the following pituitary hormones regulates oocyte maturation in fish?

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18

Which is not a characteristic of a demersal egg?

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19

Which of the following two hormones are essential for induced breeding of fishes?

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20

On an average one centimorgans (cM) is equal to

Linkage, Recombination Kinetics, Genetic Dist Linkage, Recombination Kinetics, Genetic Dist ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

21

The name for a chromosome map unit is

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22

Recombination percentage in a diploid cannot exceed

Linkage, Recombination Kinetics, Genetic Dist Linkage, Recombination Kinetics, Genetic Dist ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

23

Q-banding (Quinacrine) used in the chromosomal banding technique is

Chromosomal Cytogenetics Chromosomal Cytogenetics ICAR JRF Fish Genetics And Breeding 2024 Shift 1 MCQ (Single Correct) +4 / −1

24

The thickness of the chromatin filament is.

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25

is untrue for Fluorescent In-Situ Hybridisation

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