Question

If, in a plant, red colour of the flower is dominant over white. A cross was made between a plant containing red flower and other with white flower. The cross yielded 50% white flowered plant and 50% red flowered plant. The genotype of the parent with red flower is:

• A. Homozygous
• B. Heterozygous
• C. Cannot be determined
• D. Can be homozygous or heterozygous

Answer 1

The correct option is B Heterozygous

A cross is made between a plant containing red flowers with another plant with white flowers. This cross yields 50% white-flowered plants and 50% red-flowered plants. That means the red-flowered plant is heterozygous dominant(Rr) and white-flowered plant(rr) is homozygous recessive. The cross is said to test cross.

So, the correct answer is 'Heterozygous'.