Wednesday, February 9, 2011

Ornate Eagle Ray Artificial Selection

            The trait I am selecting for is more offspring per litter. Each Ornate Eagle Ray can have up to four offspring already, so to do the selection process I will take females that have came from a litter of four, and take males that have came from a litter of four, then mate them. After that I will take the ones that have the most offspring and mate them with offspring from other litters of four. I would continue this process for 100 generations, careful not to mate siblings or cousins, until every Ornate Ray that has come from my process bares 4 offspring each. I chose to select this trait because the Ornate Ray is endangered and this would aid in population growth. Unfortunately, the age of sexual maturity and the gestation period is not known for the Ornate Eagle Ray (14), but the Spotted Eagle Ray (a close relative) reaches sexual maturity at age 3, and its gestation period is 4 months (16), so for 100 generations to occur, it would take 333 years and approximately 4 months. The look of the ray won't change much, because the change that's going to happen is going to be internal, but I would assume that to carry more offspring the Ornate Ray would need to grow larger than before.

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