Y-: yellow S-: star
yy: black ss: starless
All the sneetches want their children to have star...
Y-: yellow S-: star
yy: black ss: starless
All the sneetches want their children to have stars on their bellies. An embryo with either YYss or yySS genotype is lethal. Y and S are two independently assorting autosomal genes. A true breeding yellow star bellied sneetch mated with a true breeding black starless sneetch and produced 50 F1 sneetches. The F1 then mated with each other and produced 840 F2 progeny.
What proportion of black star F2 would be true breeding?
Among 840 F2 sneetches, how many of them are black star bellied sneetches?
Among 840 F2 sneetches, how many of them are black starless bellied sneetches?
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