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Answer :
When dealing with carnations and flower color, we have a situation of incomplete dominance. In this case, the flower color of carnations is determined by two alleles:
- Red flowers have the genotype RR.
- Pink flowers have the genotype RW.
- White flowers have the genotype WW.
When two pink flowers are crossed, both are of the RW genotype. Here's how to determine the expected genotypic ratio of their offspring:
1. Set up the cross: The genotypes being crossed are RW (pink) x RW (pink).
2. Determine possible combinations: You combine the alleles from each parent. Each parent has one allele of R and one allele of W. Thus, the possible combinations for the offspring are:
- RR (if both parents contribute the R allele)
- RW (if one parent contributes R and the other W)
- RW (if one parent contributes W and the other R)
- WW (if both parents contribute the W allele)
3. Write out the offspring genotypes:
- 1 RR
- 2 RW (because there are two different combinations that can lead to RW)
- 1 WW
4. Genotypic ratio: From these possibilities, the genotypic ratio of the offspring is:
- 1 RR : 2 RW : 1 WW
Therefore, the expected genotypic ratio when crossing two pink flowers is option A, which is [tex]$1 RR : 2 RW : 1 WW$[/tex].
- Red flowers have the genotype RR.
- Pink flowers have the genotype RW.
- White flowers have the genotype WW.
When two pink flowers are crossed, both are of the RW genotype. Here's how to determine the expected genotypic ratio of their offspring:
1. Set up the cross: The genotypes being crossed are RW (pink) x RW (pink).
2. Determine possible combinations: You combine the alleles from each parent. Each parent has one allele of R and one allele of W. Thus, the possible combinations for the offspring are:
- RR (if both parents contribute the R allele)
- RW (if one parent contributes R and the other W)
- RW (if one parent contributes W and the other R)
- WW (if both parents contribute the W allele)
3. Write out the offspring genotypes:
- 1 RR
- 2 RW (because there are two different combinations that can lead to RW)
- 1 WW
4. Genotypic ratio: From these possibilities, the genotypic ratio of the offspring is:
- 1 RR : 2 RW : 1 WW
Therefore, the expected genotypic ratio when crossing two pink flowers is option A, which is [tex]$1 RR : 2 RW : 1 WW$[/tex].
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