Question

Assume that flower colour is controlled by a single gene. In a given plant, red flower colour is dominant over white flower colour. Two red flower bearing plants were crossed and the progeny consists of 45 plants bearing red flowers and 4 plants bearing white flowers this indicates that

• A. Both the parents are heterozygous for the gene controlling flower colour
• B. One parent is true breeding for red flowers on the other heterozygous
• C. A mutation must have occurred in the progeny which (mutation) caused the appearance of white flowers
• D. The results are not consistent with the expected ratio 3 Red : 1 White. Hence both the parents cannot be heterozygous

Answer 1

The correct option is C A mutation must have occurred in the progeny which (mutation) caused the appearance of white flowers

Ratio is totally deviated from 3(red) : 1 (white), Hence this is a case of mutation which is resulting into this outcome.