Question

F${}_1$ generation of a cross between a red-flowered plant (RR) and a white-flowered plant (rr) predominantly consisted of red-flowered plants (Rr). This indicates that the red flower trait is:

• A. Dominant
• B. Assorted
• C. Recessive
• D. Hybrid

Answer 1

The correct option is A Dominant

A dominant trait is one that masks the effect of a recessive trait in heterozygous condition. So, in the cross between a red-flowered plant (RR) and a white-flowered plant (rr), if red-flowered plants are produced in the first generation (Rr), it is evident that the red flower trait is dominant over the white flower trait. The allele for the red colour flower (R) is masking the effect of the white colour flower allele (r).

So, the red colour trait is the dominant one and the white colour trait is recessive.