In a mating of two people of medium height (where three genes control height): aabbcc x aabbcc produce distinct phenotypes determined by the number of genes inherited.

a) one
b) two
c) five
d) seven
e) ten

Which of the following is a responsibility of a scientist

Aspecies has evolved an asexual mode of reproduction by having offspring develop from unfertilized eggs. which of the following will be true of this species' response to natural selection? there will be more deaths from natural selection because there is no mutation. there will be less genetic variation from recombination and a risk of not adapting quickly to environmental change. the species will increase in numbers because genetic variation is increased. the species will compensate for loss of genetic variation by hybridizing with other species. there will be fewer deaths from natural selection because sexual recombination always leads to extinction.

All of these things can block a bronchus and cause collapse of a lung except