A trait for flower color shows incomplete dominance, where heterozygous individuals have pink flowers. If a homozygous dominant individual were crossed with a heterozygous individual, what percentage of their offspring would exhibit pink flowers? (SC.912.L.16.1) *

Question

1 point
0%
50%
75%
100%

Answer 1

In incomplete dominance, the phenotypes of the offspring are a blend of the parental traits. In this case, let's denote:

• \( R \) = allele for red flowers (homozygous dominant, RR)
• \( r \) = allele for white flowers (homozygous recessive, rr)
• \( Rr \) = heterozygous, resulting in pink flowers

Now, if a homozygous dominant individual (RR) is crossed with a heterozygous individual (Rr):

• The possible gametes from the homozygous dominant parent (RR) are: R
• The possible gametes from the heterozygous parent (Rr) are: R and r

The Punnett square for this cross would be:

       R      R
    ----------------
R |   RR      RR
r |   Rr      Rr

From this cross, the offspring will be:

• 50% homozygous dominant (RR) - red flowers
• 50% heterozygous (Rr) - pink flowers

Thus, 50% of the offspring will exhibit pink flowers.

Therefore, the answer is 50%.