Expected frequency of tetrad spores with Tetratype

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Posts: 1
Joined: Sat May 18, 2013 3:37 am

Expected frequency of tetrad spores with Tetratype

Post by sproti » Sat May 18, 2013 3:50 am

This problem is written in my language (not english) so I'll try to translate it the best I can. I've spend the last hour trying to figure this out but I just can't understand this problem.

The fungi S. cerevisiae creates tetrad spores. How high of a ratio can be expected of tetrad spores with tetratype (both parental types and recombinants) if there are 14 map units between genes?

A. 7%
B. 14%
C. 28%
E. 86%

So I assume what they mean is basicly among PD (Parental ditype), NPD (Nonparental ditype) and T (Tetratype) what ratio of tetrad spores has the tetrad type. I understand that the tetrad type itself will have parental types of 86% (43% each) and recombinants will have 14% (7% each) but I have no idea how I figure out the ratio of tetratypes.