Suppose the mutation for the sickle cell disease gene first appeared in a region without malaria. The first carrier would have... A) been less likely to survive and reproduce than his peers.

B) been more likely to survive and reproduce than his peers.

C) had the same likelihood to survive and reproduce as his peers.

D) died from sickle cell disease before reproducing.

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

6. in domesticated cats, the following are independently assorting: normal ears (t) is dominant to tufted ears (t); curved whiskers (c) is dominant to straight whiskers (c); the presence of six toes (s) is dominant to five toes (s); gene for hair length is an x-linked codominant. the three phenotypes for hair length are long (xhxh), medium (xhxh), and short (xhxh); medium is the heterozygous condition. given two parents: ttccssxhxh x ttccssxhy how many different gametes could be formed in the female cat with respect to these four traits? how many phenotypes are possible in the offspring from this mating?

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.