Air moves into the lungs when

a. intrapulmonary pressure is less than atmospheric pressure.

b. intrapulmonary pressure is more than atmospheric pressure.

c. blood pressure is more than intrapulmonary pressure.

d. blood pressure is less than intra pulmonary pressure.

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Irving HeathcoteLv2

29 Sep 2018

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D. In a second experiment, you go back to that same base population of domestic rats and select the 10% of the animals with the lowest average systolic blood pressure. These selected animals have a mean blood pressure of 100 mm Hg. If heritability = 0.5, what would be the average systolic blood pressure in the progeny of these selected breeders in this second experiment?

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4. You are studying the physiology of hypertension (high blood pressure) using the rat as a model system and wish to breed a strain of rat which has naturally high blood pressure. Systolic blood pressure is a quantitative trait with a continuous phenotypic distribution. It is measured as millimeters of mercury displaced in a blood pressure meter (mm Hg).
You start with a base population of normal domestic rats, which has a mean systolic blood pressure of 120 mm Hg. You select the 10% of the rats which have the highest systolic blood pressure. The average systolic blood pressure value of these selected breeders is 140 mm Hg. You then interbreed the selected rats and measure the systolic blood pressure in their progeny.
What would be the average systolic blood pressure in the progeny of the selected breeders if
A. heritability = 0.5 ?
B. heritability = 1.0 ?
C. heritability = 0 ?
D. In a second experiment, you go back to that same base population of domestic rats and select the 10% of the animals with the lowest average systolic blood pressure. These selected animals have a mean blood pressure of 100 mm Hg. If heritability = 0.5, what would be the average systolic blood pressure in the progeny of these selected breeders in this second experiment?