A true-breeding plant with red flowers was crossed with a true-breeding plant with white flowers. The...

A true-breeding plant with red flowers was crossed with a true-breeding plant with white flowers. The F1 progeny all had a new flower color, pink. The F1 plants were inter-crossed, and produced 44 red, 135 pink, and 61 white flower plants.
1. (4 pts.) What is the most likely mode of inheritance being exhibited in these phenotypes. State your hypothesis and provide your reasoning, which can also include why other modes of inheritance are unlikely (process of elimination). Do not assign any genotypes at this point.
2. (16 pts.) Using gene symbols of your choice, provide genotypes for all individuals in the P, F1, and F2 generations. If you have to make an arbitrary choice about which set(s) of alleles to assign to a certain phenotype, be sure that the logic of your assignment is consistent across your entire answer. Show your work.
3. (7 pts.) Test your hypothesized mode of inheritance using a chi-square test. Consider p < 5% (or 0.05) the cut-off for statistical significance. Show your work and be sure to state your conclusion based on the test.

Solutions

Expert Solution

A. A true breeding of plants with red flowers and white flowers are crossed , the F1 progenies all had a new flower colour , pink. Here the cross illustrates that red and white exhibits incomplete dominance. There is blending of dominant red and recessive white alleles. The F1 pink coloured flower is due to the mixing of alleles. The F1 progenies are intercrossed and then produced all flower colours ; namely red ,white and pink in different proportions . The heterozygosity is due to a mutant gene. Mutant allele results in an altered phenotype producing an active gene product and anormal phenotype.

B. GENOTYPES of parents

Red Flower ( dominant) : RR

White Flower ( recessive) :

gladiator answered 1 year ago

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