What is the area between the tropical and polor zones

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?

The activity of the modern sample is 1.10 bq . how long does that measurement take?

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities