In cod, the genes for short fins (sf), rough scales (rs) and spotted body (sb) a

Question

In cod, the genes for short fins (sf), rough scales (rs) and spotted body (sb) are located on a single chromosome separated by the following map distances:

sf ---(10.5)---rs-------(26.5)------sb

A female with short fins and a rough scales was mated to a male with a spotted body (assume that these traits are mutant phenotypes, and that the mutant alleles are recessive).

The resulting phenotypically wild-type females were mated with males that had the mutant phenotype for all three traits, producing 900 offspring.

Question: Assume that interference for these genes is 0.16. How many offspring are expected to have the following phenotypes?

short fins & rough scales OR spotted body

Enter your answer as a whole number, round to the nearest integer.

Explanation / Answer

the short fins , rough scales genotype is given by: a+a+b+b+c+c+ and genotype of spotted body is given by aabbcc.

the f1 wild type females are crossed with males to produce 900 f2 offspring.

the genotypes of f2 offspring is given by

a+bc

ab+c

abc

a+b+c

abc+

a+b+c+

a+bc+

ab+c+

map distance is given by (SCO + DCO)/ 1000 * 100

SCO is single crossover number

DCO is double crossover number

the map distance between short fins and rough scales is 10.5 and map distance between rough scales and spotted body is 26.5

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