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Our genes can be controlled by both external and internal signals. This is very apparent in one type of hydrangea plant which can produce either blue or pink flowers.
Which of the following explains how could this be possible?
Hydrangea - Blue. N.d. Web. 30 Dec. 2015. https://en.wikipedia.org/wiki/Hydrangea.
Hydrangea - pink. N.d. Web. 30 Dec. 2015. https://en.wikipedia.org/wiki/Hydrangea.
A gene mutation causes a change in the gene for flower color.
Environmental factors affect the expression of the gene for flower color.
This could be due to a seasonal effect that changes the expression of the gene for flower color depending on the season.
The flower color is dependent on the type of pollinator that frequents the flower.