Question

Which example could be evidence for an organism's growth being influenced by the organism's genes?
A.
A horse species can be made larger by mating together only large horses.
B.
A pig that eats more food will grow to be larger than a pig that eat less food.
C.
Sunflowers grown in the wild are smaller than sunflowers grown inside.
D.
Specific grass species grow at different rates depending on the available water supply.

Answer 1

A.

Selective breeding (mating only large horses) producing larger offspring is evidence that size is heritable — i.e., influenced by genes. The other choices describe environmental effects on growth.