The allele for blood group A and the allele for blood group B are codominant. Gregor Mendel investigated the inheritance of alleles using flowering plants.He showed that the allele for red flowers (IR ) is codominant with the allele for white flowers (IW). A heterozygous plant produces pink flowers. Explain the outcome if two plants that produce pink flowers are crossed. You should complete the Punnett square as part of your answer – 10014

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1. The flower colour is inherited through incomplete dominance, where neither red nor white is fully dominant, so the RW genotype gives pink flowers.

   If one parent has white flowers (WW) and the other has red flowers (RR), their gametes would be W and W from the white-flowered plant, and R and R from the red-flowered plant. However, in this case both parents must be RW, since the Punnett square includes RW × RW as the cross.

   The Punnett square shows the possible combinations:

   RW × RW gives:

   1 WW = white flowers (25%)

   2 RW = pink flowers (50%)

   1 RR = red flowers (25%)

   So, there is a 50% chance the offspring will have pink flowers, and a 25% chance each for white and red flowers.

   This means pink is the most likely flower colour in the offspring, because it is the result of having one red and one white allele.

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