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One flower is heterozygous red (Rr) and it is crossed with a homozygous white (rr) plant. Use a Punnett square to determine the probability of one of their offspring having a red color.

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hanafubuki
Since the heterogeneous flower crossed with the homogeneous there would be two dominant and two recessive.
Ver imagen hanafubuki
luisvaschetto

The probability of having a plant with a red phenotype (Rr genotype) from this cross is 50%.

  • In diploid (2n) organisms, heterozygous individuals have two different variants or 'alleles' for the same gene locus, whereas homo-zygous individuals have the same allele for a given gene.

  • In this case, a parental has rr genotype, thereby this homo-zygous plant can produce only one type of gametes (r), whereas the other parental has Rr genotype, thereby this heterozygous plant can produce two types of gametes (either r or R).

  • In consequence, the Punnett square for this F1 cross is:

             r

R     1/2 Rr

r      1/2 rr

In conclusion, the probability of having a plant with a red phenotype (Rr genotype) from this cross is 50%.

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