Always return the microscope lens to the (ix) when you are done. Always use (x) to clean
the microscope lenses. Never use the (xi)
with (x1).
when you are done.​

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?