Heredity - Evolution — Chapter Summary

Differences in characters within very closely

Differences in characters within very closely related groups of organisms are called variations. Variations arise through sexual reproduction and erro

Gregor Johann Mendel worked on inheritance

Gregor Johann Mendel worked on inheritance in pea plants from 1857, using nearly 10,000 pea plants of 34 varieties. He studied seven contrasting chara

When two contrasting factors come together

When two contrasting factors come together, one may express itself in the first generation and the other may remain hidden. The expressed trait is dom

Each character is controlled by

Each character is controlled by a pair of factors, and during gamete formation the pair separates so that each gamete receives only one factor.

A cross involving one pair

A cross involving one pair of contrasting characters shows a phenotypic ratio of 3:1 in F2 and a genotypic ratio of 1:2:1. In a yellow-seed × green-se