Question
Given the results of the genetic cross between the homozygous person with freckles and the homozygous person without freckles, what percent of the offspring could have freckles?
A.
0%
B.
25%
C.
50%
D.
100%
A.
0%
B.
25%
C.
50%
D.
100%
Answers
GPT-4o mini
To determine the percentage of offspring that could have freckles from a genetic cross between a homozygous person with freckles and a homozygous person without freckles, we first need to define the alleles involved.
Let's assume:
- "F" represents the allele for freckles (dominant).
- "f" represents the allele for no freckles (recessive).
If one parent is homozygous for freckles, their genotype will be "FF", and if the other parent is homozygous for no freckles, their genotype will be "ff".
When we perform a Punnett square with these genotypes:
| | F | F |
|---|---|---|
| f | Ff | Ff |
| f | Ff | Ff |
All offspring (100%) will have the genotype "Ff", which means they will all exhibit the freckles trait, as "F" (freckles) is dominant over "f" (no freckles).
Therefore, the answer is:
D. 100%
Let's assume:
- "F" represents the allele for freckles (dominant).
- "f" represents the allele for no freckles (recessive).
If one parent is homozygous for freckles, their genotype will be "FF", and if the other parent is homozygous for no freckles, their genotype will be "ff".
When we perform a Punnett square with these genotypes:
| | F | F |
|---|---|---|
| f | Ff | Ff |
| f | Ff | Ff |
All offspring (100%) will have the genotype "Ff", which means they will all exhibit the freckles trait, as "F" (freckles) is dominant over "f" (no freckles).
Therefore, the answer is:
D. 100%