Primary succession occurs when pioneer species move into an area that has no plants. Which organisms are common pioneer species? Answer
A Conifer trees and tall grasses with roots that loosen the soil
B Mosses and lichens that can grow on rocky surfaces
Grasses and weeds that arrive as seeds carried by the wind and then germinate in rich soil
D Vines and shrubs that help prevent the erosion of shallow soil

Suppose a particular species of tulip plant has three alleles for the gene that codes for flower color. the cr allele produces red tulips, the cp allele produces purple tulips, and the cw allele produces white tulips. cr is dominant over cp and cw, and cp is dominant over cw. for each of the following crosses, determine the expected ratio of offspring for each flower color. cr cp x cp cw cr cw x cp cw 1 red: 1 purple : 0 white, 1 red: 2 purple: 1 white, 2 red: 1 purple 1 white, 1 red: 3 purple : 0 white, 2 red: 0 purple : 2 white, 2 red: 2 purple : 0 white