What is the theory of punctuated equilibrium? A. It describes one way that new species arise. B. It explains how domestic animals evolved. C. It explains why mass extinction occur. D. It describes the rate of geologic time.

answer: a. a gene that causes a specific trait.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

the answer is sex-linked recessive.