Awild-type strain of haploid yeast is crossed to a mutant haploid strain to make a diploid. what phenotypic ratios will be observed in the haploid progeny of the diploid? a. 50% wild-type and 50% mutant b. all wild-type c. 75% wild-type and 25% mutant d. 25% wild-type and 75% mutant e. all mutant

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

About how much of the cell mass is watet