A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR).What percentage of the offspring will be homozygous dominant (RR)? _______
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The percentage of plants that have the dominant RR is 50%.
According to Mendel, factors of inheritance called genes are located in the chromosomes. Genes usually occur in pairs called alleles. The genes in an allelic pair may be dominant or recessive. The dominant gene is always expressed while the recessive is only expressed in the absence of the dominant gene.
Using a Punnet square, we can see that the percentage of plants that have the dominant RR is 50%.
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If you take the two sets and put them into a punnett square, it would look like this (image attached):
When the two sets of alleles are crossed, you would end up with half of your pairs being fully dominant (RR), and the other half being dominant while containing a recessive gene (Rr). Since there’s only one recessive gene in these pairs, it gets overridden and the pair itself is dominant.
So your answer is 50% will be homozygous dominant with RR!
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