During meiosis A ratio of 9:4:3 in the F2 generation is indicative of: Codominan

Question

During meiosis A ratio of 9:4:3 in the F2 generation is indicative of: Codominance results in: In Drosophila, fused veins is inherited as an X-linked recessive. If a fused vein male is crossed with a wild type female, the phenotypes of the F1 offspring will be: The recessive mutations curved wing and sepia eye are located on different autosomal chromosomes in Drosophila. A curved wing female is crossed to a sepia eye male to produce the F1. If an F1 female is then crossed to a curved wing, sepia male, what phenotypic ratio will be expected in their offspring?

Explanation / Answer

1. a. crossingover occurs

In meiosis, Alignment of homologous chromosomes at Mid-Prophase –I is characteristic of meiosis. The two chromosomes sharing the same quality are called “homologous chromosomes.” These chromosomes crossover at some point and rejoin to form recombinant chromatids. Now, these chromosomes are separated at Anaphase-I and move to their opposite poles.The splitting of centromeres (occur during meiosis-II) and reduction of chromosome number by four does not occur during Meiosis-I.

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