le saime chromosome 7.5 Genes on different chromosomes recombine with a fre- que
ID: 214240 • Letter: L
Question
le saime chromosome 7.5 Genes on different chromosomes recombine with a fre- quency of 50 percent. Is it possible for two genes on the same chromosome to recombine with this frequency? 7.6 If two loci are 10 cM apart, what proportion of the cells in prophase of the first meiotic division will contain a single crossover in the region between them? 7.7 Genes a and b are 20 cM apart. An at blat b individual was mated with an a bla b individual. (a) Diagram the cross and show the gametes produced by each 7 parent and the genotype of the F 1* (b) What gametes can the F, produce, and in what proportions? (c) If the F, was crossed to a bla b individuals, what offspring (d) Is this an example of the coupling or repulsion linkage (e) If the F, were intercrossed, what offspring would be expected would be expected, and in what proportions? phase? and in what proportions?Explanation / Answer
Answer:
7.5 Genes present on same or different or same chromosome have 50% recombination frequency and they assort independently. If the genes on the same chromosome are located closely then they don't assort independently and have a recombination frequency less than 50%.
7.6 20% of cells in prophase of the first meiotic division will contain single crossover between two loci.
7.7
a) a+b+/a+b+ X a b/a b
Gametes are a+b+ and a b
b) a+b+= 40%; a+b= 10%; a b =40%; ab+ = 10%
c) a+b+/ab X a b/ a b
a+b+ a+b+/ ab= 40%; a+b a+b/ a b = 10%; ab+ ab+/ a b= 10%; a b a b/a b= 40% (4:1:1:4)
d) Coupling
e) Phenotypes:
a+b+ = 66%; a+b = 9%; ab+ = 9%; ab= 16%
e)
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