Individuals of a certain tree species experience a markedly higher mortality rate at age 200 and beyond. Name two other changes you would expect in 200-year-old trees if this increase in mortality was accompanied by senescence
What will be an ideal response?
ANS:
decline in reproduction of 200 year survivors, and decline in defense against pathogens that are no problem for younger individuals
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Which of the following organisms lack membrane bound organelles?
a. plants b. animals c. prokaryotes d. fungi
The CAM pathway
a. involves only the Calvin-Benson cycle b. involves only the C4 cycle c. is used by plants in humid regions d. is also known as photorespiration e. needs day and night for completion
Meiosis is to gametes as fertilization is to
A. mitosis. B. sperm. C. egg. D. zygote. E. chromosome.
The Dunkers are a religious group that moved from Germany to Pennsylvania in the mid-1700s. They do not marry with members outside their own immediate community
Today, the Dunkers are genetically unique and differ in gene frequencies, at many loci, from all other populations including those in their original homeland. Which of the following likely explains the genetic uniqueness of this population? A) population bottleneck and Hardy-Weinberg equilibrium B) heterozygote advantage and stabilizing selection C) mutation and natural selection D) founder effect and genetic drift