Three recessive genes in dogs are linked on a chromosome. A dog heterozygous for all three...

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Biology

Three recessive genes in dogs are linked on a chromosome. A dogheterozygous for all three recessive alleles is crossed withhomozygous for all the recessive alleles in a three-pointtestcross.
(a) Determine the order of these genes on thechromosome and
(b) calculate the map distances between thegenes.
The progeny of the testcross are:
r Â Â Â TÂ Â Â WÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 324
R Â Â Â tÂ Â wÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 319
R Â Â tÂ Â Â WÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 880
rÂ Â TÂ Â Â Â Â wÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â 887
R Â Â Â TÂ Â WÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2376
rÂ Â Â Â tÂ Â Â Â Â wÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2365
r Â Â tÂ Â Â Â WÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 47
RÂ Â Â TÂ Â Â Â Â wÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 41
Total Â Â Â Â 7,239

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4.0 Ratings (656 Votes)

The genotype of higher progeny number with be the genotype of parents So here the highest is progenies 2376 and 2365 indicated the parent genotype ie RTW and rtw To know the gene order we should compare the genotype of parents with double cross overs See Answer

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