Discoveries in the field of __________ provided key evidence needed for natural selection to be widely accepted as the mechanism of evolution (select one).

a. radiometric dating

b. fossils

c. genetics

d. DNA sequencing

e. medicine

Important implications of the theory of evolution by natural selection include (select all that apply):

a. All organisms, including humans, are descended from a common ancestor.

b. The biological world is constantly evolving.

c. Nature designs things intentionally.

d. Traits found in organisms are the outcomes of a goal-less process.

e. Humans occupy one ordinary branch on an enormous tree of life.

John Endler performed an experiment involving guppies in which he demonstrated evolution driven by natural selection that worked through a predator-prey relationship. Which of the following are true statements about the results of his experiments? (Select all that are correct.)

a. Males with longer tails and brighter coloration were more frequently eaten by predator fish.

b. Females preferred to mate with dull- colored males.

c. When males were put in a predator- free environment, brighter coloration and larger tails evolved in them.

d. In the predator-free environment, the average brightness of females increased.

e. When predators were reintroduced, duller coloration and smaller tails evolved in the males.

PCR has been described as a copying machine for _______.

In forensic biotechnology, the value of PCR is that it allows the establishment of identities based on _____ samples of DNA.

The DNA of every individual contains groups of ________ whose number can be used to establish the identity of that individual.

Embryonic stem cells (ESCs) are derived from embryos when they are in the blastocyst stage, which occurs about

(a) 5 days (b) 5 weeks (c) 5 months following conception.

Induced pluripotent stem cells (iPS cells) are like ESCs in that they seemingly can give rise to _____ human cell types, yet they are unlike ESCs in that they are derived from ______ cells.

iPS cells could in theory solve the problem of the rejection of transplanted tissue because, through such cells, transplanted tissue might be generated from a patient’s ____.

To “clone” means to make an exact ______.

Reproductive cloning is cloning intended to produce _____. of a defined genotype.