Question

purple flowers are dominant to white flowers. a true - breeding purple flower was crossed with a true - breeding white flower. what are the genotypes and phenotypes of the f1 generation? 100% heterozygous | 100% purple 100% heterozygous | 50% purple and 50% white 75% homozygous dominant and 25% homozygous recessive | 75% purple and 25% white 50% homozygous dominant and 50% homozygous recessive | 50% purple and 50% white 50% homozygous dominant and 50% heterozygous | 50% purple and 50% white question 20 1 pts chris and lillian both have detached earlobes, which is a recessive trait. one of their children has attached earlobes. should chris suspect that lillian is a cheater cheater pumpkin eater? yes no no answer text provided. no answer text provided.

Explanation:

Flower Genetics Problem (First Question)

Step1: Define Genotypes

Let \( P \) be the dominant allele (purple) and \( p \) be the recessive allele (white). A true - breeding purple flower has genotype \( PP \) (homozygous dominant), and a true - breeding white flower has genotype \( pp \) (homozygous recessive).

Step2: Perform the Cross

When we cross \( PP \) and \( pp \), using the Punnett square method, all the offspring (F1 generation) will have the genotype \( Pp \) (heterozygous). The phenotype of \( Pp \) is purple because the dominant allele \( P \) is present. So the F1 generation is 100% heterozygous and 100% purple.

Detached earlobes is a recessive trait, let the recessive allele be \( d \) and the dominant allele (for attached earlobes, but wait, actually detached is recessive, so attached would be dominant? Wait, no, the problem says detached earlobes is a recessive trait. So the genotype for detached earlobes is \( dd \), and for attached earlobes, it can be \( DD \) or \( Dd \). If both Chris and Lillian have detached earlobes, their genotypes must be \( dd \) (since it's a recessive trait, to express the recessive phenotype, they must be homozygous recessive). When we cross two \( dd \) individuals, all their offspring will have the genotype \( dd \) (detached earlobes). But one of their children has attached earlobes (which would require at least one dominant allele \( D \)). Since both parents can only contribute \( d \) alleles, it is impossible for them to have a child with attached earlobes. So Chris should suspect that Lillian is not being truthful (the answer is "yes").

Answer:

100% heterozygous | 100% purple

Ear - Lobe Trait Problem (Question 20)