The example of ocean and lake stickleback fishes indicates that morphology can be altered
A)only by changing the sequences of protein-coding genes.
B)by altering the expression of a developmental gene in some parts of the body but not others.
C)by environmental factors (in this case, pollution).
D)by the elimination of a gene (Pitx1)from a population, which leads to loss of the trait (body armor and spines).

Question

Quizplus · Accepted Answer

The example of ocean and lake stickleback fishes shows that morphological changes can occur by altering the expression of developmental genes like Pitx1 in specific body regions, rather than changes in the gene sequence itself.

The Example of Ocean and Lake Stickleback Fishes Indicates That