The photograph shows monarch butterflies landing on plants where there are thousands of other monarch butterflies. these butterflies feed on milkweed plants as they travel south for the winter, covering distances of 5,000 km or more each year. however, the population of these butterflies has been steadily declining over the last 20 years. what is the most likely reason the population of these butterflies has been declining?

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