A lunar eclipse occurs when the moon passes through earths shadow. a lunar eclipse can only occur during a a. last quarter moon
b. first quarter moon
c. new moon
d. full moon

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?

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.

The smallest parts of these that retain their original properties are called