HEREDITY: INHERITANCE AND VARIATION

Units of inherited information

• genetic variation

• mendelian genetics

• genetics

• genes

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The science that study heredity.

• genes

• genetic variation

• genetics

• DNA

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A trait that is being masked of another trait.

• recessive trait

• heterozygous

• dominant trait

• homozygous

These are alleles that have nonidentical genes.?

• allele

• heterozygous alleles

• homozygous alleles

• trait

A trait that mask the expression of another trait.

• recessive trait

• heterozygous

• homozygous

• dominant trait

What happens to cause air to be exhaled from the lungs?

• The rib muscles contract and move outward

• The chest cavity expands and grows larger.

• The diaphragm relaxes and moves upward.

• The lungs contract and then expand.

What term do scientists use to describe the chemical process in which oxygen and glucose react to release energy inside body cells?

• inhaling

• exhaling

• respiration

• breathing

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When blood flows into the right atrium from the body, it contains.

• little oxygen and a lot of carbon dioxide

• a lot of oxygen and little carbon dioxide

• a lot of both oxygen and carbon dioxide

• little of either oxygen or carbon dioxide

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Blood vessels that carry blood away from the heart are called

• veins

• arteries

• capillaries

• lymphatic vessels

Exercise is important for cardiovascular health because it

• increases blood pressure

• strengthens heart muscle

• slows the heartbeat

• reduces sodium in the blood