A series of two-point crosses were carried out among seven g…

A series of two-point crosses were carried out among seven genes (a, b, c, d, e, f, and g) producing the following recombination frequencies. Using these recombination frequencies, you map the seven genes, showing their linkage groups.  How many linkage groups did you find? – Take your time this is 4 point questions  Hint – you need to draw the genetic map for all seven genes first.  Genes Recombination Frequency (%) Genes Recombination Frequency (%)         a and b 10 c and d 50 a and c 50 c and e 8 a and d 14 c and f 50 a and e 50 c and g 12 a and f 50 d and e 50 a and g 50 d and f 50 b and c 50 d and g 50 b and d 4 e and f 50 b and e 50 e and g 18 b and f 50 f and g 50 b and g 50        

In Drosophila, yellow bodies (y ) and white eyes (w ) are bo…

In Drosophila, yellow bodies (y ) and white eyes (w ) are both caused by recessive X-linked alleles. The normal alleles (y+ amd w+ ) cause tan bodies and red eyes, respectively. A y w female is mated to a y+ w+ male and the F1 progeny are allowed to mate with each other. Two hundred F2 were observed and they are: 55 y w; 45 y w+; 45 y+ w; 55 y+ w+.  What is the chi-square value for the test for goodness of fit of the null hypothesis of no linkage? (Recall that the chi-square statistic is the sum, for all classes, of (O-E)2/E.)