30) A homozygous groucho fly (g, bristles about the eye) is crossed with a homozygous rough...

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Biology

30) A homozygous groucho fly (g, bristles about the eye) iscrossed with a homozygous rough fly (r, eye abnormality). The F1females are test crossed to a groucho, rough fly. The followingdata was obtained.
514 Groucho
466 Rough
11 Groucho, rough
9 Wild type
Are these genes linked? Is the F1 in coupling or repulsionphase. Draw out the heterozygous parents genotype onchromosomes.
33)
Three corn genes, R, D and Y lie on chromosome 9. The map of thethree genes, using map units is:
Â Â Â Â Â Â Â Â Â Â Â 20Â Â Â Â Â Â Â 40
R -------D--------------Y
A heterozygous plant (R D Y/r d y) is crossed with a testcrossparent (r d y/r d y) :
how many double cross over progeny would be expected in aprogeny of 1000 if there were no interference?
What is the interference if there are 50 DCOs?
B= brown body, b = black body, N =non-waxy wings, n = waxy wings, R = red eyes, r = cinnabar eyes
What is the order of the genes?
What is the recombination frequency for each gene pair?
Draw a map with the genes listed and the correct map units.
Is there interference? If so what is the value.

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3.6 Ratings (324 Votes)

30 gRgR Groucho x GrGr roughParents gRGr Wild typeF1 gRGr Wild type x grgr groucho roughTest cross Dihybrid test cross ratio must be in 1111 if the genes are not linke But the given number is not similar so that they are said to be linked F1 progeny are in repulsion phase Heterozygous genotype is gRGr 33 RDY rdy X See Answer

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