Why do organisms look the way they do?

Front

How many pairs of chromosomes do humans have?

Back

Humans have 23 pairs of chromosomes.

Front

What is the term for the genetic makeup of an organism?

Back

Genotype.

Front

What is the observable physical characteristic of an organism?

Back

Phenotype.

Front

How many generations are typically shown in a pedigree chart?

Back

A pedigree chart can show multiple generations, often 3 or 4.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that is only expressed when two copies of the gene are present.

Front

What is the difference between a histogram and a bar graph?

Back

A histogram displays numerical data while a bar graph displays categorical data.

Front

What is the basic unit of heredity?

Back

Gene.

Front

What is the process by which traits are passed from parents to offspring?

Back

Heredity.

Front

What is a phenotype?

Back

The phenotype is the physical expression of a genotype.

Front

What is a dominant trait?

Back

A dominant trait is one that is expressed even if only one copy of the gene is present.