variation and evolution

Question 1

what is variation

Answer 1

the differences in characteristics in a population

Question 2

what causes variation

Answer 2

inherited genes of individuals, or environmental conditions of individuals

Question 3

what is evolution

Answer 3

gradual change in inherited characteristics of a population over time

Question 4

what is natural selection

Answer 4

natural selection states that all species have evolved from simple life forms that first developed 3 billion years ago

Question 5

how do mutations help variation and natural selection

Answer 5

mutations rarely affect the phenotype but when they do it can give certain individuals an advantage over others

Question 6

who is Wallace

Answer 6

suggested a similar theory to darwin in 1885 which pushed darwin to publish his theory

Question 7

what is evidence for evolution

Answer 7

fossils

Question 8

how are fossils made

Answer 8

hard parts of animals don’t decay

when parts of an organism are replaced by other materials as they decay

Question 9

why are there gaps in fossil records

Answer 9

early life forms were soft bodied so the little traces left have been destroyed by geological activities

Question 10

what is antibiotic resistance

Answer 10

some bacteria mutate a resistant gene
other bacteria are killed by antibiotics leaving good conditions for multiplying
new strand is created