Explain how reproductive isolation is central to the biological species concept
What will be an ideal response?
ANSWER: The biological species concept defines species in terms of population genetics and
evolutionary theory based on the ability to interbreed. Two different reproductive isolating
mechanisms are recognized, prezygotic and postzygotic, which are, respectively, premating
and postmating mechanisms. Reproductive isolation prevents gene pools of two species
from mixing.
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Select all of the following that are true about the chondrichthyans.
_____ They have internal fertilization. _____ They were the first fish to develop teeth. _____ Their buoyance is maintained by oil. _____ They are known for acute color vision. _____ Their teeth are composed of dentin and enamel.
Secondary endosymbiotic algae
What will be an ideal response?
Tay-Sachs disease is a genetic disorder in which fat deposits build up in nerve cells of the brain, leading to a slow loss of function. Because this disease usually strikes children under 1 year of age, the symptoms are not immediately apparent
Think about the symptoms that this condition would cause. List some that you think are possible. What would be the inevitable end result as the disease progresses?
What is a cost to the female in a polygynous mating system?
A. little opportunity to mate with a genetically fit male B. high risk of contracting sexually transmitted diseases C. little help from male in caring for offspring D. high competition between females for access to males