If in a plant red colour of the flower is dominant over white. A cross was made between a plant containing red flowers and another with white flowers. The cross yields $50 %$ white-flowered plants and $50 %$ red-flowered plants. The genotype of the parent with a red flower is:

Homozygous

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Heterozygous

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Can not be determine

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Can be homozygous or heterozygous

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Solution

The correct option is B
Heterozygous

The correct option is B:
Explanation of correct option:
The organism containing a different character or alleles is called heterozygous, like Tt, both alleles are heterozygous.
When crossing between red flower (RR) and white flower (rr), the obtained ratio is Rr (Heterozygote).
The cross with red color (Rr) and white color (rr), the obtained ratio is $1 : 1$ .while the red color flower (Rr) is a heterozygote.
Explanation of incorrect option:
Option A:
The organism containing a particular character or identical alleles is called homozygous, like TT, tt both alleles are homozygous.
Option B:
The cross is determined.
Option D:
The genotype of the parent is heterozygous.
Final answer: The genotype of the parent with a red flower is heterozygous.

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If in a plant red colour of the flower is dominant over white. A cross was made between a plant containing red flowers and another with white flowers. The cross yields 50% white-flowered plants and 50% red-flowered plants. The genotype of the parent with a red flower is:

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