Question

Over several years, a scientist successfully isolates a species of flower for white color. this year, when the new generation of flowers blooms, one yellow flower is found in the population. which is the best reason for the appearance of a new flower color within the species?

Answer 1

1. May be due to a mutation in the allele coding for white colour, which results in an allele coding for yellow colour in the flowers.

2. The original white flower that was isolated may have been heterozygous, Ww, where W codes for the white pigment in flowers, and W is dominant to w. The crossing of Ww × Ww will give offspring with genotypes of WW, Ww, Ww, ww, genotypic ratio of 1:2:1, and phenotypic ratio of 3 white :1 yellow. The offspring with the yellow flowers has a genotype of ww, homozygous recessive.

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