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.

Afarmer began a new method of reducing grain spills. this reduced the number of mice on the farm. the number of snakes in the surrounding area decreased at the same time. the snakes depended on the mice that lived in the field. what’s the likely reason the snake population decreased? a. the number of snake predators increased. b. the number of mice increased. c. the number of mice decreased. d. the pesticides affected the snakes. e. a new breed of mice moved into the field.