The occurs when we form an impression of an individual based on a single trait.

1. key concept list themajor biomes, and give onecharacteristic feature of each.

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?

Explain how scientists use geologic time to determine the age of landforms.