Green sea turtles eat sea grass that grows on the sea floor. Seagrass, a foundation species, provides an important breeding ground for fish and other marine organisms. A conservation program for the green sea turtles plans to introduce more turtles into an ecosystem. What could be the immediate effect of this on the ecosystem? A) More species of fish would migrate to the region. B) The new turtles would drive out the existing population. C) The region would witness a spurt in the growth of sea grass. D) There would be a decrease in the population of marine organisms.

D)

Explanation:

Turtles eat the grass, grass is needed for fish breeding. If there are more turtles, they will eat more grass and there will obvious be less of it. If there is not enough grass, other populations of fish will leave because they can't breed.

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).