Kip studies flower color in petunias, where the allele for red flowers, R, is dominant to the allele for white flowers, r. If Kip makes the cross RR x rr, the gametes that are produced:
A. will all carry the r allele.
B. will all carry the R allele.
C. by one parent will carry R and by the other parent will carry r.
D. by one parent will carry Rr and by the other parent will carry rR.
Answer (3)
Letter C) by one parent will carry R and by the other parent will carry r.
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C ;
The correct answer is C, as the gametes from the RR parent will all carry the R allele and the gametes from the rr parent will all carry the r allele. Consequently, all offspring will inherit one R and one r allele, resulting in a heterozygous genotype R r . This cross demonstrates basic principles of Mendelian genetics involving dominant and recessive alleles.
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