our possibly different albino strains of Neurospora were each crossed to wild ty

Question

our possibly different albino strains of Neurospora were each crossed to wild type. All lted in 1/2 wild-type and 1/2 albino progeny. Crosses were made between the first (Bonus) F crosses resu strain and the other three with the following results: 1 x 2:975 albino : 25 wild type 1 x 3: 1000 albino 1 x 4: 750 albino : 250 wild type What is happening on each of these crosses; in other words, which mutations represent different genes and which of those genes seem to be linked? (1 pt) How did you arrive to these conclusions? Please, explain your answer. (1 pt)

Explanation / Answer

1 x 3:

All the progenies are of wildtype, meaning that the mutations occured are allelic and therefore these recombination have failed to appear.

1 x 4:

Ratio = 750:250 =>3:1

The above ratio is the ratio of independant assortmen. So these follow indepemdent assorment.

1 x 2:

Ratio = 975:25 => 39:1

The above indicated ratio is not that of independent assorment. 25 progenies are the half of the double mutants. So total double mutant = 25*2 =50.

Recombinant % = 50/1000 = 5%.

Thus these genes are linked.

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