Acertain segment of dna can be used as a molecular clock. its rate of mutation is one mutation per 15 million years. examine the dna segments from two different species: species a: gttgagctagtatggacc species b: gataagctagtaaggtca using this example, explain how this information can be used to determine how long ago these two species shared a common ancestor. be sure to answer this question in paragraph form using complete sentences.

Species A: GTTGAGCTAGTATGGACC

Species B: GATAAGCTAGTAAGGTCA

These species differ in 5 nucleotides.

This number should be multiplied by the rate of mutations; that is;

5 × 15 million years =75 million years.

the answers are as following:

1. c. double helix, nucleosome, coil, supercoil, chromosome

2. b. g2 phase, preparation for mitosis

3. d. interphase consists of the g1, s, and g2 phases

4. c. metaphase

5. a. chromosomes are duplicated before cell division so that each new daughter cell has a complete set