4. Monohybrid Sex-linked Problems Red-green color blindness is caused by a sex-l

Question

4. Monohybrid Sex-linked Problems Red-green color blindness is caused by a sex-linked recessive allele. A color-blind man marries a woman with normal vision whose father was color-blind. a. This couple has a daughter. What is the probability that this daughter is color-blind? The couple has a daughter, then the probability will be 25% ????). b. This couple also has a son. What is the probability that this son is color-blind? The couple has a son, then the probability will be 25% (Xao. 5. Dihybrid Inheritance Problem In pea plants, tallness and green color are both dominant to short and yellow. If a tall green pea plant (rGg) is crossed with a tall green pea plant (TiGa), what are the phenotypes and genotypes of the offspring? Tall, green pea Tall, green pea Tall, green pea Tall, green pea The phenotype of the offspring will be tall, green and tall, yollow. The genotype will be Tall, green pea Tall, yellow pea Tall, green pea Tall, yellow 19

Explanation / Answer

Phenotypic Ratio   =    6 (Tall, green pea) : 2 (Tall, yellow pea)

                            =      3 : 1

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Genotypic Ratio = 1 (TTGG) : 2 (TTGg) : 1 (TtGG) : 2 (TtGg) : 1 (TTgg) : 1 (Ttgg)

                        = 1 : 2 : 1 : 2 : 1 : 1

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