Name: 16 he ene locd E.F, R are all ocated on autosome 3 in ladybugs. A map belo

Question

Name: 16 he ene locd E.F, R are all ocated on autosome 3 in ladybugs. A map below indicates the map distances of these three loci. A female ladybug with genotype feH/ a male ladybug of genotype FEr/FEr. An F1 female ladybug was then testcrossed with a male of genotype fer/fer. 1000 testcross offspring were generated. feR was crossed to 13 m.u.- 22 m.u. A. List the expected phenotypic classes of progeny, the recombinant class they represent and the expected # of progeny in that class. Assume zero interference and round progeny to whole numbers

Explanation / Answer

According to the information, the genes are located 13 and 22 map units apart from each other and different alleles are found on male and female counterparts. These male and female counterparts are made to cross with each other and the resulting offsprings are being observed for their phenotypes.

Here, it is very important to note that geneticists have shown that those genes which are located less than or equal to 30 map units apart from each other are inherited as linked to each other and do not undergo recombination due to close proximation on the chromosomes. Thus, these genes too shall not undergo recombination and the progeny will inherit the same set of alleles and their patterns as in the parents.

Thus, the various classes can be found as below:

Progeny class: Same as parental, i.e. half like mother and rest half like father

Recombinant class: None

Expected # of progeny: 1000 offsprings (as given in the information)

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