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Assume a phenotype is determined by one gene with a dominant allele and a recessive allele. If one parent is homozygous recessive and the other is heterozygous, what is the probability that an offspring will have the recessive phenotype?
a. 50%b. 100%c. 25%d. 0%e. 75%

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waqaskhan15836

Answer

a. 50% will be  homozygous recessive

Explanation

as phenotype is dominant so suppose R allele for dominant and r allele for recessive

so cross between  homozygous recessive (rr) and heterozygous (Rr)

                                          r                  r

                          R             Rr                Rr

                          r                rr                 rr

(heterozygous ------- 50 %

( homozygous recessive)------------------50 %

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