CBSE Class 12-science Answered
Genes C and P are Complementary in Sweet pea plant and when present together produces coloured flowers. What will be the product of cross between CcPp × Ccpp?
(1)
2 white and 6 coloured flowers
(2)
3 white and 5 coloured flowers
(3)
2 coloured and 6 white flowers
(4)
3 coloured and 5 white flowers
Asked by Atulcaald | 15 May, 2018, 02:37: PM
Expert Answer
Parents: CcPp × Ccpp
Gametes: CP, Cp, cP, cp × Cp, cp
Product: CCPp, CcPp, CCpp, Ccpp, CcPp, ccPp, Ccpp, ccpp
In sweet pea, the flowers are either white or purple. The genes C and P when present alone e.g., Ccpp, ccPp, CCpp, ccPP give white colour to the flower. Absence of both the dominant genes (ccpp) also results in white colour. On the other hand if they are present together (CCPp, CcPP, CcPp, CCPP) the colour of the flower becomes purple. The purple colour is, therefore, a result of complementary effect of the two genes.
- CCPp: Coloured
- CcPp: Coloured
- CCpp: White
- Ccpp: White
- CcPp: Coloured
- ccPp: White
- Ccpp: White
- Ccpp: White
Ratio of white : coloured flowers = 5: 3
Answered by Sheetal Kolte | 15 May, 2018, 05:51: PM
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