The maternal and paternal copies of a chromosome are known as the: Group of answer choices gametes. heterozygous pair. homologous pair. haploids.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Consider this plant cell which organelle is labeled g

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above