Which of the following is not true about homologous chromosomes? a. they code for different traitsb. they are pairs of matching chromosomesc. one copy is inherited from each parentd. all of these are true(if u can tell me why pleasse, ! )

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.

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities

Which is an innovation of gymnosperms? gymnosperms are the first seed plants. gymnosperms are the first flowering plants. gymnosperms are the first vascular plants. gymnosperms are the first spore plants.