1 points QUESTION 5 Uranium-238 is a radioactive element that will decay into le

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1 points

QUESTION 5

Uranium-238 is a radioactive element that will decay into lead-206. It has a half-life of 4.5 billion years, which means that after 4.5 billion years exactly one-half of the total amount of uranium-238 that you started with will have decayed into lead-206. Suppose you were given a 100-gram solid block of uranium-238, and you buried it in the ground. Nine billion years from now, if someone dug it up and analyzed it, how much uranium-238 would be left?

a. 0 grams

b. 50 grams

c. 75 grams

d. 25 grams

e. 100 grams

1 points

QUESTION 6

In what type of cells must mutations occur before the mutations can be important in evolutionary change within a population?

a. autosomes

b. gametes

c. blood cells

d. somatic cells

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QUESTION 7

The term "Natural Selection" is not interchangeable with the term "evolution" because:

a. Natural Selection does not always lead to evolution.

b. Natural Selection is just a theory, whereas evolution has been proven.

c. Darwin coined the term evolution, but not Natural Selection.

d. a population may evolve in ways other than through Natural Selection.

1 points

QUESTION 8

An allele is ________.

a. the gene pool of a population

b. a particular characteristic

c. a genotype

d. a particular version of a gene

Explanation / Answer

1 points QUESTION 5 Uranium-238 is a radioactive element that will decay into le

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