Which of the following evolutionary forces can introduce new genetic variation into a population?
natural selection and genetic drift
mutation and gene flow
natural selection and nonrandom mating
mutation and genetic drift

The endoplasmic reticulum (er) is an organelle in some cells. in these cells, it is continuous with the nuclear membrane and forms a large part of the cell\'s total membrane. sort the phrases below as describing rough er, smooth er, both, or neither. note: if you answer any part of this question incorrectly, a single red x will appear indicating that one or more of the phrases are sorted incorrectly.1) found in prokaryites and uekaryotys2) involved in protein synthesis3) involve in lipid synthesis4) contains molecular chaperones in lumen5) bound with ribosomes6) involved in toxin or drug metabolism7) large systemot internnected tubules,vesicles, and sacs8) "packages" enzymes in vesicles for secretion.

28. how many linkage groups will be formed by homogametic organism with 28 chromosomes?

Plz ! what does it mean for an allele to be dominant?