Um pesquisador cruzou casais de ratos cinzas e obteve filhotes de cor cinza e de cor branca. Entre os 32 filhotes encontrados na prole desses casais, qual o número de filhotes heterozigotos, de filhotes homozigotos dominantes e o número de filhotes homozigotos recessivos?

Explain why phospholipid molecules form a bilayer. (3 marks)

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Which of the following is an effect of the uneven heating of the earth by the sun? a sea breeze a land breeze a convection current all of the above