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A brown eyed dad and a green eyed mom can have a blue eyed child because there are at least two eye color genes. Because of this, it is possible for both green and brown eyed parents to be carriers for blue eyes.

And as carriers, they each can pass down blue eye genes to their children. Let's go into a bit more detail about how all of this works. We'll also do Punnett squares for the two most likely possibilities in your case to figure out the chances of your parents having a blue eyed child.

As I said, eye color happens because of at least two separate genes. The first gene, OCA2, comes in two forms, brown (B) and blue (b). The second gene, called gey, comes in two forms, green (G) and blue (b). Here is a table that shows how these genes are thought to work together to create eye colors

Explanation:

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: