Chapter 19 Variation and Natural Selection

Which name is given to the observable features of an organism?

• alleles

• genes

• genotype

• phenotype

What is not a feature of natural selection?

• competition for resources

• production of many offspring

• selection by humans

• variation within the population

What is a mutation?

• a condition caused by a dominant allele

• a change in a gene or chromosome

• a process used in genetic engineering

• a type of continuous variation

The diagram shows the age structure of a human population. Which age group has the largest number of people?

• 60 and over

• 45-59

• 30-44

• under 15

What is an example of a characteristic that shows discontinuous variation in humans?

• body mass

• height

• blood group

• width of hand

There are two types of variation, which are ......

There are two types of selection, which are .....

Selective breeding is also known as ......

He is the father of evolution. His name is .....

The scientific name for peppered moth is .....