1. Purple flowers are dominant to white flowers in the Jimsonweed plant. When a
ID: 162200 • Letter: 1
Question
1. Purple flowers are dominant to white flowers in the Jimsonweed plant. When a particular purple-flowered Jimsonweed is self-pollinated, there are 28 purple-flowered and 10 white-flowered plants in the F1 Generation. What are the genotypes of the parents? What is the phenotypic and genotypic ratio of the F1 Generation?
2. Incomplete dominance is seen in snapdragons. The allele that causes red flowers (F) is not completely dominant over the allele that causes white flowers (f). When a plant is heterozygous for the trait of flower color (Ff), pink flowers results. Cross two pink snapdragons, and provide the genotypic and phenotypic of all the offspring.
3. Two black guinea pigs were mated and produced 29 black and 9 white offspring. What were the genetypes of the parent guinea pigs? What are the expected phenotypic and genotypic ratios of the offspring?
Explanation / Answer
Since the plant is self pollinated and the ratio is in 3:1 the parents are heterozygotes which means they carry the alleles for both purple as well as white
Hence the genotype of the parent would be Pp x Pp where P represents purple and dominant and p represents white and recessive.
The genotypic ratio would be 1:2:1 and 3:1 would be the phenotypic ratio the white flowers being homozygous recessive and purple progeny only the homozygotes breed true and constitute 1/3 purple progeny.
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