This Punnett square shows the crossing of two heterozygous plants with red flowers. R = dominant red, r = recessive white
The Punnett square is a chart used to predict an results of a genetic cross It is used to determine the probability of the occurrence of each genotype among offspring. The Punnett square shows every possible combination for a specific cross of maternal and paternal genotypes.
In this case, both parents are heterozygous for the red flower trait, meaning they carry one dominant allele (R) and one recessive allele (r). The Punnett square will display the four possible combinations of these alleles in their offspring.
| R | r |
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R | RR | Rr |
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R | RR | Rr |
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Each cell in the Punnett square represents one possible genotype that could appear in the offspring. The letters at the top and left side of the square represent the alleles from the maternal and paternal genotypes, respectively. In this case, the possible genotypes that can result from this cross are RR, Rr, Rr, and rr.
The Punnett square also provides information about the probability of each genotype occurring in the offspring. In this case, since both parents are heterozygous, they each have a 50% chance of passing on either the dominant R allele or the recessive r allele. Hence, the probability of obtaining offspring with the RR genotype is 25%, the probability of obtaining offspring with the Rr genotype is 50%, and the probability of obtaining offspring with the rr genotype is 25%.