Consider the following test for genetic linkage between two genes designated Gen
ID: 173703 • Letter: C
Question
Consider the following test for genetic linkage between two genes designated Gene A and Gene B, each with a dominant and recessive allele: Original true-breeding parents: AA BB x aa bb rightarrow Aa Bb (F1) Test cross: Aa Bb x aa bb rightarrow progeny classes Some of the progeny of the test cross have recombined the alleles present in the original parents, in other words they have the following genotypes: Aa bb aa Bb Which of the following explanations could account for recombination of the parental alleles in the test cross progeny? A Gene A and Gene B could be on separate chromosomes. B. Gene A and Gene B could be on the same chromosome but very far apart from each other. C. Gene A and Gene B could be linked to each other on the same chromosome, and a chromosome crossover could occur in between them during prophase of meiosis I. D. All of the above could explain recombination of parental alleles in the progeny of the test cross. E. None of the above, because it is impossible for parental alleles to recombine during meiosis.Explanation / Answer
the answer will be option D.
If both of the genes are on different chromosome then we will get the Aa bb and aaBb progeny.
If both of the genes are on the same chromosome and very far then there might be recombination due to which we will get the Aa bb and aaBb progeny.
If both of the genes are on the same chromosome and linked and far enough for them to crossover during prophase I of meiosis due to which we will get the Aa bb and aaBb progeny.