If someone has a dominant phenotype, their genotype can either be heterozygous or homozygous. the diagram shows a punnett square for a particular trait among two parents, but one letter of a parent’s genotype is missing. which describes the letter that belongs where the question mark is? a. t because there are offspring that are heterozygous b. t because there are offspring that are homozygous c. t because there are offspring that are homozygous. d. t because there are offspring that are heterozygous.

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

All eukaryotic cells contain small bodies called