Question

cross - pollination of flowers from different populations of the same species will most likely result in —
a gene flow as new alleles are introduced
b evolution of a different species as alleles mix
c hybrid sterility as gametes from different individuals are incompatible
d a decrease of genetic variation among individuals

how do other body systems interact with the endocrine system to regulate body processes?
select two correct answers.
the nervous system helps control the release of hormones throughout the body.
the immune system helps prevent infection from hormones within the body.
the digestive system helps convert hormones into proteins that are absorbed within the body.
the circulatory system helps transport hormones throughout the body.
the integumentary system helps provide oxygen to initiate hormone production throughout the body.

the diagram shows changes in blood pressure over time.
diagram: a graph with blood pressure on the y - axis and time on the x - axis. there is a dashed line labeled set point. the graph line starts near the set point, rises, then there is an arrow labeled signals to (1) decrease heart rate (2) vasodilate. then the line falls below the set point, and there is an arrow labeled signals to (1) increase heart rate (2) vasoconstrict, and then the line rises back to the set point.
vasodilation and vasoconstriction occur because blood —
a flows through veins and arteries
b is a necessary component for life
c flows through the heart at various rates
d pressure is controlled by a feedback mechanism

Explanation:

First Question (Cross - pollination)

• Option A: Cross - pollination between different populations of the same species introduces new alleles, which is gene flow.
• Option B: Mixing alleles of the same species does not lead to a new species (speciation requires more factors like reproductive isolation over time).
• Option C: Gametes of the same species are compatible, so hybrid sterility is not likely.
• Option D: Introducing new alleles increases genetic variation, not decreases it.

• The nervous system (hypothalamus - pituitary axis) controls hormone release (correct).
• The immune system fights infections, not related to hormone - related infections (incorrect).
• The digestive system digests food, not convert hormones to proteins (incorrect).
• The circulatory system (blood) transports hormones (correct).
• The integumentary system (skin) does not provide oxygen for hormone production (respiratory system does that) (incorrect).

• Option A: Blood flowing through veins and arteries is a fact but not the reason for vasodilation/constriction.
• Option B: Blood being necessary for life is general and not the cause of these processes.
• Option C: Vasodilation/constriction is about blood vessel diameter, not heart flow rate.
• Option D: The diagram shows a feedback mechanism (signals to adjust heart rate and vessel diameter) controlling blood pressure, so vasodilation and vasoconstriction occur as part of this feedback - controlled blood pressure regulation.

Answer:

A. gene flow as new alleles are introduced

Second Question (Body systems and endocrine system)