Quiz Review: Inheritance

Which statement best defines a trait?

• A characteristic passed from parents to offspring

• A scientific experiment

• A type of chromosome

• A behavior an organism learns

What does phenotype describe?

• The alleles inside a gene

• The chromosomes in a cell

• The genes an organism has

• How a trait looks or is expressed

Heredity refers to:

• How organisms change during life

• The passing of traits from parents to offspring

• How traits disappear

• The study of plants

Gregor Mendel is important because he:

• Named chromosomes

• Studied animal behavior

• Invented microscopes

• Discovered how traits are passed down

What does true-breeding mean?

• Parents are hybrids

• Parents have no recessive traits

• Offspring show traits that match the parent

• Offspring always look different from parents

When Mendel crossed true-breeding purple flowers, the offspring were:

• Light purple

• All purple

• Half purple and half white

• All white

When Mendel crossed true-breeding purple flowers with true-breeding white flowers, the first generation offspring were:

• All white

• All purple

• Half purple and half white

• Light purple

Why was Mendel surprised by the first-generation results?

• Only one trait appeared instead of blending

• The plants grew too fast

• No plants grew

• The flowers were a mix of colors

The first-generation plants from purple × white crosses are called:

• Dominant plants

• Hybrid plants

• Recessive plants

• True-breeding plants

When two hybrid purple plants were crossed, some white flowers appeared. What does this show?

• Purple traits disappear forever

• Traits blend together

• White traits are destroyed

• Recessive traits can reappear