GATE XL 2017 Paper 1 — page 17

Questions 49–51 of 125. Imported answers require review unless explicitly marked reviewed.

In a hypothetical trihybrid cross of three loci (viz. A, B, C), all were inherited in a complete dominant manner over their recessive alleles a, b, c, respectively. When a test cross between F1 and parent ‘aabbcc’ was performed, following genotypes of eight phenotypically distinct classes were observed with respective numbers

Class	Genotype	Number
1	ABC	412
2	abc	406
3	Abc	85
4	aBC	80
5	ABc	08
6	abC	07
7	AbC	01
8	aBc	01

The genetic distance (up to one decimal) between A and C loci will be ________ cM.

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In a typical sexually reproducing angiospermic plant, if an endosperm cell contains

nucleotide pairs of DNA, then a microspore of this plant will have ______

nucleotide pairs of DNA.

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Identify the CORRECT matching between group I and group II in relation to ecology

GROUP I P. The physical environment of an organism Q. The totality of the needs of a population for survival and its resource utilization R. The position of a species in a food chain S. Basic functional unit comprising living community and its physical environment

GROUP II

Trophic level

Habitat

Ecosystem

Niche

Ecological pyramid

Your answerChoose one option.

P-2, Q-5, R-4, S-1

P-2, Q-4, R-1, S-3

P-5, Q-2, R-3, S-1

P-1, Q-3, R-4, S-2

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2017 · Paper 1

Question 49

Question 50

Question 51