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NEET BIOLOGYMedium

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt, what percentage of the offspring will be tall with red fruit?

A

50% will be tall with red fruit

B

75% will be tall with red fruit

C

All the offspring will be tall with red fruit

D

25% will be tall with red fruit

Step-by-Step Solution

To solve this dihybrid cross (), we analyze each gene independently :

  1. Fruit Colour (): Parent 1 produces only gametes. Parent 2 produces only gametes. All offspring will be (Heterozygous Red). Probability of Red fruit = 100% (1).
  2. Height (): This is a typical test cross for height . Parent 1 produces and gametes (50% each). Parent 2 produces only gametes. Offspring will be 50% (Tall) and 50% (Short).

Combined Probability: Probability (Red and Tall) = Probability (Red) Probability (Tall) = or 50%.

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