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17. A pea plant with pure round seods (RR) is crossed with a pea plant having wrinkledseeds(rr). What will be the Fi and F: progeny? |
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Answer» Lets say that RR is a gene for dominant trait and rr is a gene for recessive trait. (a) The gene of the parent with dominant trait is RR and parent with recessive trait is rr. (b) When we cross both the parents (RR X rr) we get all progenies with round seeds. (c) Cross between two of the F1 progenies is known as second filial cross and produce F2 progenies. In this case by crossing two of the F1 progenies (Rr X Rr) we will get following ratio of F2 progenies.F2 generation-- Genotypic ratio :-1:2:1 (1 progeny with RR gene, 2 progenies with Rr gene and 1 progeny with rr trait).Phenotypic ratio:- 3:1 (3 progenies with round seeds and 1 progeny with wrinkled seed). |
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