A pea plant that has round seeds are dominate over winkled seeds in pea plant. Fill in the punnett sqares and determine the expected genotypes and phenotypes of the f1 generation by crossing homozygous recessive and heterozygous parents.

A homozygous recessive pea plant would have genotype rr and the heterozygous plant would have genotype Rr. So after the crossing between these two individuals occurs the two offspring produced would be heterozygous and the other two would be homozygous recessive.                    

                                      R    r

                                r   Rr   rr

                                r    Rr   rr

Therefore the genotype ratio would be 1:1 and the phenotypic ratio would also be 1:1 in the F1 generation because half would be round and half would be wrinkled.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

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