New variations of genes may be produced by all of the following EXCEPT
a. immigration.
b. mutation.
c. crossing over.
d. sexual reproduction.
e. fission.
E
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Disturbance and exposure at borders of habitat fragments are collectively termed ____
a. edge effects b. fragmentation effects c. anthropogenic disturbances d. reduced perimeter diversity e. boundary decline
Despite seeming counterproductive, an increase in arterial carbon dioxide levels activates ________, which causes a(n) ________ in heart rate and a(n) ________ in total peripheral resistance.
A) chemoreceptors: decrease : decrease B) baroreceptors : decrease : decrease C) baroreceptors : decrease : increase D) baroreceptors : increase : increase E) chemoreceptors : decrease : increase
What results when the surfactant in the lungs is affected by smoking?
A) increased respiratory surface area B) decreased gas exchange in the alveoli C) reduced ability of hemoglobin to carry oxygen D) increased concentrations of carbon monoxide
How do you explain this result?
You are trying to improve growth in an economically important fish species. These fish have a gene for large size with two alleles (L,l). You cross a large female (LL) with a small male (ll) and get all large fish! The genotypes of the F1 are 100% Ll, so you assume that large size is dominant to small. You then cross a small female with a large male and get all small fish! The genotypes of this F1 are normal. A. The gene for large size is a maternal effect gene. B. L is not dominant to l. C. The gene for large size is a sex-linked gene. D. L is dominant to l. E. The gene for large size is a maternal effect gene and L is dominant to l.