11) A chromosome carries A1 B1 alleles for genes A and B and the other homolog carries A2 B2. If one Holliday junction region between the two genes is resolved by an NS cut and the other by an EW cut, the resulting chromosomes A) are recombinant and carry the combinations A1 and B1 or A2 and B2. B) are A1 and A2 or B1 and B2. C) are nonrecombinant and carry the combinations A1 and B2 or A2 and B1. D) are nonrecombinant and carry the combinations A1 and B1 or A2 and B2. E) are recombinant and carry the combinations A1 B2 or A2 B1, respectively
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1) We have two homologous chromosomes: one carries A1B1 alleles and the other carries A2B2 alleles. Show more…
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A chromosome with genetic markers A, B, C, D, E, and F ( “*” represents the centromere ) is shown below: a b C * d e f G H J Another chromosome is found to contain A B G F E D * c h J If these two chromosomes are paired and a single crossover takes place between the nonsister chromatids. The resulted recombinant chromosomes are listed below. a b C * d e F G B A /J H D G f E D *c h J Where in the chromosome the single crossover must occur to obtain these recombinant chromosomes? Single crossover occurs between E and F Single crossover occurs between F and G Single crossover occurs between C and D Single crossover occurs between D and E
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