Question

Flower color in a particular plant species is determined by one gene. The alleles of that gene can code for either red flowers or blue flowers. When a red plant and a blue plant are crossed, some of the offspring produce purple flowers. What is the genotype of the plants with purple flowers? options: The genotype is BB because of incomplete dominance. The genotype is Bb because of incomplete dominance. The genotype is bb because of incomplete dominance. The genotype has nothing to do with the color of the flower.

Answer 1

The correct answer is: The genotype is Bb because of incomplete dominance.

Step-by-step explanation:

• Incomplete dominance is a type of Non-Mendelian inheritance in which neither of the two alleles is dominant over each other.
• Both the alleles get expressed in a heterozygous individual harbouring both the alleles.
• Hence this heterozygous individual shows a phenotype that is in between the two homozygous phenotypes.
• In the given question, let us represent the red phenotype with b allele and the blue phenotype with B allele.
• The red (bb) and the blue (BB) parents are both homozygous.
• Gametes produced by each are b and B respectively.
• Crossing them,

B

b Bb

• After crossing, their offspring will have the Bb genotype, with a purple coloured phenotype, where the purple colour is between red and blue.