Biology part 2 Systems

Question 1

Reasons why organisms may be prevented from producing fertile offsprings

Answer 1

geographic isolation, temporal isolation (mating in different seasons), genetic incompatibility

Question 2

Polymorphism

Answer 2

a gene that has multiple alleles, corresponding to distinct forms of a phenotype
Provides raw materials for speciation

Question 3

Gene pool

Answer 3

the total of all alleles in a population

Question 4

Evolution

Answer 4

a change in a population’s gene pool
Even if the ratio of a phenotype changes temporarily, as long as the ratio of the alleles remains the same, the population has not evolved.
If the ratio does change, or if a new allele is formed by a mutation, evolution has occurred
Evolution can sometimes result in speciation, the formation of a new species.

Question 5

Mechanisms that contribute to speciation

Answer 5

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