Why does milk have to be kept in refrigerator? Choices: 1-The reactions that cause milk to spoil are slower at lower temps
2- Physical changes that cause milk to spoil are slower at lower temps
3- no chemical or physical changes can occur at lower temps

Where do homologous chromosomes exchange genetic material through crossing over?               a.  chlorophyll    b.  centrosomes    c.  centromeres    d.  chiasma

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.

Which pedigree symbol is used to represent a female carrier of a recessive x-linked trait? поө0 || save and exit submit