Question

Assertion : The pink coloured flowers appear in $F_2$ generation of plant Mirabilis jalapa .
Reason : This is observed due epistatic suppression of white colour alleles in one of parental flowers by red colour alleles.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (C)

In Mirabilis jalapa (four o'clock) there are two types of flower colour in pure state: red and white. When the two types of plants are crossed, the hybrid or plants of $F_1$ generation have pink flowers. If the latter are selfed, the plants of $F_2$ generation are of three types-red, pink and white flowered in the ratio of $1 : 2 :1$ . The pink colour apparently appears due to incomplete dominance of red (dominant) over white (recessive). Thus, pink is differentiated from red and white.