(a) Gene (b) y w RF pair 1.1 32.8 y-V 33.0 34.3 y m 34.3 (c) y w y r 42.9 w. 32.
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(a) Gene (b) y w RF pair 1.1 32.8 y-V 33.0 34.3 y m 34.3 (c) y w y r 42.9 w. 32.1 1.1 w-m 32.8 33.0 W-r 42.1 V-m 4.0 34.3 V-r 24.1 42.9 17.8 (d) y m-r 1.1+ 32.1 4.0 17.8 55 42.1 far apart sum of individual two-point crosses recordabinantclasses 53.9 parental classes only these two genes second double crossovers difference between close together recombination frequency first In part (c), the distance from gene y to gene r is the observed when two-point crosses are performed using In part (d), the distance from gene y to gene r is the the RFs between each pair of genes as determined using The discrepancy between the y-to-r distance in part (c and part (d) is most likely a result of occurringExplanation / Answer
** I am doing the first four parts. Please post other parts separately.
In part (c) the distance from gene y to gene r is the recombination frequency observed when two-point crosses are performed using only these two genes.
In part (d) the distance from gene y to gene r is the sum of the RFs between each pair of genes as determined using individual two-point crosses.
The discrepancy between the y to r distance in part (c) and (d) is most likely a result of double crossovers.
A double cross-over is more likely between two genes that are close together; double cross overs increase the number of offsprings in parental classes and therefore lower the RF.
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