In sheep, white colour (D) is dominant to black colour (D). A white ewe (female) was crossed with a black ram (male). All the F1 offspring were white. What are the genotypes of

1. the white ewe?

2. the black ram?

List the advantages and disadavantages of the switch from persistent chlorinated hydrocarbon pesticides (such as ddt) to nonpersistent organophosphate pesicides. have the benefits of the switch outweighed the disadvantages? explain.

Has magnification ability of hundreds of thousands of times

What does spontaneous generation mean?