A scientist crossed a white flower with a red flower.He expected some offspring to be white and others to be red.Instead,many offspring were pink.What occurred and how can you tell?
Chou Gods ng mpl
What process that brings heat from the lower mantle toward the crust?(1 point)
Responses
conduction
conduction
convection
convection
compression
compression
cementation
The occurrence of many pink offspring instead of a mix of white and red can be attributed to a genetic phenomenon called incomplete dominance. In complete dominance, one gene is expressed over another, resulting in a trait that matches the dominant gene. However, in incomplete dominance, neither gene is fully dominant, and the resulting trait is an intermediate blend of both genes.
To understand why many offspring were pink, we need to determine the genetic makeup of the parent flowers. Let's assign a capital letter (W) for the dominant allele responsible for the white color and a lowercase letter (r) for the recessive allele responsible for the red color.
The white flower parent can be represented as WW (since it only has the white allele), and the red flower parent can be represented as rr (since it only has the red allele).
When these two parents are crossed, their alleles combine to form the offspring's genetic makeup. Let's look at the possible combinations:
1. If the parent plants were both homozygous (WW x rr):
- The white parent (WW) can only donate a W allele.
- The red parent (rr) can only donate an r allele.
- The resulting offspring will have the genotype Wr and the phenotype might appear as pink.
2. If the parent plants were both heterozygous (Ww x rr):
- The white parent (Ww) can donate either a W or w allele.
- The red parent (rr) can only donate an r allele.
- The resulting offspring will have the genotypes Wr and wr, with a probability of inheriting either. Therefore, some offspring may appear pink, while others may appear white or red.
By observing the resulting phenotype of the offspring (pink color), we can deduce that the parent plants carried the alleles for incomplete dominance. Additionally, if the offspring produced from the cross are intercrossed and result in a 1:2:1 phenotypic ratio of white:pink:red, it further confirms the presence of incomplete dominance.