Chromosomes occur _________; genes occur _________(a) singly, singly(b) singly, in pairs(c) in pairs, singly(d) in pairs, in pairsI had been asked this question in quiz.Origin of the question is Chromosomal Theory of Inheritance-2 topic in division Principles of Inheritance and Variation of Biology – Class 12

Chromosomes occur _________; genes occur _________(a) singly, singly(b

1.	Chromosomes occur _________; genes occur _________(a) singly, singly(b) singly, in pairs(c) in pairs, singly(d) in pairs, in pairsI had been asked this question in quiz.Origin of the question is Chromosomal Theory of Inheritance-2 topic in division Principles of Inheritance and Variation of Biology – Class 12
Answer» The correct choice is (d) in pairs, in pairs The best I can explain: A DIPLOID CELL has double the set of chromosomal content. Hence there are two copies for each chromosome present. These are called homologous chromosomes. Now, GENES are FRAGMENTS of DNA present on the chromosomes. Hence they also occur in pairs, with one gene present on each homologous chromosomes.

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