Genetics? Please Help!!?

Posted on 2016-02-17 18:18:00 in Biology by KETTY

1) You sample a number of cells that have undergone meiosis looking for the production of recombinants between the genes ec and s. You find 76 cells with no crossovers between ec and s, 17 cells with 1 crossover between ecand s, 6 cells with 2 crossovers between ec and s, 1 cells with 3 crossovers between ec and s, and zero cells with four or more crossovers. What is the map distance between the genes ec and s?

16 cM 
24 cM 
32 cM 
36 cM 
48 cM 

2) Homozygous wild-type Drosophila females were crossed with males homozygous for two autosomal recessivemutations—vestigi...‡ which produces short wings, and black (b), which produces a black body. All the F1 flies had long wings and gray bodies; thus, the wild-type alleles (vg+ and b+) are dominant. The F1 females were thentestcrossed to vestigial, black males, and the F2 progeny were sorted by phenotype and counted. From this examination, 18 out of 100 F2 offspring showed recombinant phenotypes. Approximately how far apart are the vgand b genes? 

18 centiMorgans 
18 Morgans 
82 centiMorgans 
82 Morgans

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