The type of reproductive isolation in which two populations live in the same habitual but remain isolated from one another due to one being active during the daytime only and the other being active only during the night is
A. behavioral isolation.
B. gametic isolation.
C. mechanical isolation.
D. temporal isolation.
E. sexual selection.
D. temporal isolation.
You might also like to view...
The first electron acceptor of cellular respiration is ________
A) CO2 B) O2 C) NAD+ D) H2O
Which of the following hormones increases blood pressure by constricting arterioles all over the body?
A) Angiotensin B) Aldosterone C) ADH D) Erythropoietin
Kelp forests along the Pacific Coast are in decline. You are a scientist studying potential causes for this de-cline. Kelp (a form of brown algae) is eaten by two species of sea urchins
The first urchin species is native to the Pacific, whereas the second species is an exotic species that was in-troduced from the Atlantic by human activity. The introduced urchins currently occur only near the seaports where they were first introduced, but they are expanding their geographic range. Sea otters prey on sea ur-chins. Sea otters were driven almost to extinction by hunting, but are now re-colonizing the Pacific coast. You conduct the following experiments and make the following observations: • Kelp forests thrive in areas with sea otter populations except in areas where introduced sea ur-chins overlap with the sea otters. • Removing sea urchins by divers results in kelp growth. • When you census the sea urchin populations, you find that native sea urchins tend to outnumber exotic sea urchins except in areas where otters are present. • When you enclose a single species of sea urchins with kelp in the field, you find that native sea urchins consume kelp at twice the rate than the exotic urchins. Indicate the net impact on population numbers that the first species has on the second species in this food web by using the following symbols: 0 = no impact, + positive impact, – negative impact. Exotic sea urchin (1)________ kelp Native sea urchin (2)________ kelp Sea otter (3)__________ exotic sea urchin Sea otter (4) __________ native sea urchin Native sea urchin (5) ____________ exotic sea urchin What is the future of the kelp forests? Justify your statement. What will be an ideal response?
Examine Type 4 hypersensitivities by completing the sentence. Type 4 dysfunction is known as ______________ hypersensitivity for symptoms arise one to several days following secondary antigen exposure.
A) Xenografts B) Delayed C) Autografts D) Contact dermatitis E) MHC 1 F) T G) Tuberculin H) Allografts I) GVHD J) Type 4