A geneticist mapping the genes a, b, c, d, and e makes two crosses. The first cr

Question

A geneticist mapping the genes a, b, c, d, and e makes two crosses. The first cross of pure lines is:

aabbCCDDEE X AABBCCddEE

The F1 generation is testcrossed, and the F2 are classified by the gametic contribution of the F1 as
follows

A B C D E 48
a b C d E 52
A B C d E 195
a b C D E 205
A b C d E 201
a B C D E 199
A b C D E 49
a B C d E 51

Total 1000

The second cross of pure lines is:

AABBCCDDEE X aaBBccDDee

The geneticist performs a testcross using the F1 from this cross and obtains the following progeny:

A B C D E 356
a B c D e 366
A B c D e 41
a B C D E 37
A B C D e 10
a B c D E 12
a B C D e 90
A B c D E 88

Total 1000

The geneticist also knows that genes b and e assort independently, whereas d and c do not.
A. Draw a map of these genes, showing distances in map units wherever possible
B. Is there any evidence of interference (show work)? If so, give the coefficient of coincidence

Explanation / Answer

Despite advances in genetic mapping of quantitative traits and in phylogenetic comparative approaches, these two perspectives are rarely combined. .... sufficient to consider the crosses A × B, A × C, and B × D, as with just these .... case one may omit any one of the three crosses, B×C, B×E, C×E:

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