7th Science Chapter 4 review

 What did Gregor Mendel do to study different characteristics in his genetics experiments?

• He cross-pollinated both plants and animals.

• He cross-pollinated plants.

• He studied only tall and short pea plants.

• He studied only asexual plants.

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What does a Punnett square show?

• all of Mendel’s discoveries about genetic crosses

• only the dominant alleles in a genetic cross

• only the recessive alleles in a genetic cross

• all the possible outcomes of a genetic cross

A purebred chicken with white feathers is crossed with a purebred chicken that has black feathers. Each of their offspring has both black and white feathers. Why does this happen?

• Both alleles for feather color are dominant.

• Both alleles for feather color are recessive.

• The alleles for feather color are neither dominant nor recessive.

• Several alleles work together to determine the trait.

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What happens during meiosis?

• Two sex cells combine.

• Each sex cell copies itself to form four new chromosomes.

• Chromosome pairs remain together when new sex cells are formed.

• Chromosome pairs separate and are distributed into new sex cells.

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Which term refers to physical characteristics that are studied in genetics?

• traits

• offspring

• generations

• hybrid

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Which of the following traits is influenced by both inheritance and environmental factors?

• the ability to sing well

• natural hair color

• the ability to cough

• dyed hair color

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 Factors that control traits are called

• genes.

• recessives.

• purebreds

• parents.

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 Scientists call an organism that has two different alleles for a trait a

• dominant.

• purebred.

• hybrid.

• factor.

What does the notation Tt mean to geneticists?

• two dominant alleles

• homozygous alleles

• one dominant allele and one recessive allele

• two recessive alleles

What is probability?

• the actual results from a series of events

• the way the results of one event affect the next event

• a number that describes how likely it is that an event will occur

• the number of times a coin lands heads up

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