Question

a red snapdragon flower (rr) is crossed with a white snapdragon flower (rr). the offspring are all pink flowers (rr). could breeding a pink snapdragon flower (rr) with a white snapdragon flower (rr) result in a red flower (rr)?

yes

no

only sometimes

cannot be determined

Explanation:

To determine if breeding a pink snapdragon (Rr) with a white snapdragon (rr) can result in a red flower (RR), we analyze the possible genotypes of the offspring. The pink flower has genotype Rr, so it can produce gametes R and r. The white flower has genotype rr, so it can only produce gametes r. When we cross Rr (pink) and rr (white), we use a Punnett square:

• R (from Rr) crossed with r (from rr) gives Rr (pink).
• r (from Rr) crossed with r (from rr) gives rr (white).

There are no possible combinations that result in RR (red) because the white flower (rr) can only contribute r alleles, and the pink flower (Rr) can contribute R or r. To get RR, we would need two R alleles, but the white flower cannot provide an R allele. So the answer is No.

Answer:

B. No