Question

Which example could be evidence for an organism's growth being influenced by the organism's genes?
A.
Vegetation grows at different rates depending on the available water supply.
B.
Orchids grown in a greenhouse are smaller than orchids grown in the wild.
C.
A cat that eats more food will grow to be larger than a cat that eat less food.
D.
A hamster species can be made smaller by mating together only small hamsters.

Answer 1

D.

Selective breeding (mating only small hamsters) changes the population's size over generations by choosing heritable traits — evidence that genes influence growth. The other choices describe environmental effects (water, greenhouse conditions, food).