Unformatted text preview: genotype = w y+ m
3. compare - the only one that is the different is in the middle crossover between most
distant genes (region I)
crossover between closest
genes (region II)
double crossover 26 check that there are 8 sets for the mapping calculation. X-linked data from males of a cross
v b+p+ 580
v b p+
1448 What’s the genotype of the
two biggest numbers - v b+ p+; v+ b p+
F2 genotype is all 8 What’s the gene order?
P is in the middle Map distances?
(v-b = 19.6 m.u.)
(v-p = 13.2 m.u.)
(b-p = 6.4 m.u.) data sets with less than 8 (ie. 6), generally double crossover is missing - not enough breeding?
- another instance - breed millions of ﬂies and not see the crossover - due to interference. 27 Interference
The number of double crossovers may
be less than expected
Why? Because sometimes a crossover in
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- Winter '14
- Genetics, double crossovers