The sickle-cell anemia allele is an example of the heterozygote advantage. True
ID: 168542 • Letter: T
Question
The sickle-cell anemia allele is an example of the heterozygote advantage.
True
False
Which of the following is a detritivore?
phytoplankton
mushroom
mouse
corn
Which of the following could be a density-independent factor limiting human population growth?
famines
earthquakes
plagues
pollution
Which of the following is the single most important cause of loss of biodiversity?
habitat loss
species overexploitation
biomagnification
introduced species
Energy can be recycled within an ecosystem.
True
False
In general smaller populations have less genetic diversity.
True
False
Which of the following organisms would be most likely to accumulate toxins due to biological magnification?
phytoplankton
zooplankton
small fish
large fish
If q = .2, then 2pq equals
0.32
0.8
0.4
0.16
All of the following are density-dependent factors except
rainfall amounts
predation
nutrient availability
amount of available space
A population that experiences high mortality rates early in life followed by a high survival rate until the end of the normal life span exihibits which type of survivorship curve?
Type III
Type I
Type IV
Type II
phytoplankton
mushroom
mouse
corn
Explanation / Answer
Q.1 The sickle-cell anemia allele is an example of the heterozygote advantage
Answer-True
Descrition-heterozygous advantage in which heterozygote genotype has a higher relative fitness than either the homozygote dominant or homozygote recessive genotype. sickle-cell disease a condition in which the red blood cells are abnormally shaped, if they inherit two faulty copies of the gene for the oxygen-carrying protein haemoglobin. The faulty gene persists because even carrying one copy of it confers some resistance to malaria.Sickle cell trait describes a condition in which a person has one abnormal allele of the hemoglobin beta gene-heterozygous but does not display the severe symptoms of sickle-cell disease that occur in a person who has two copies of that allele-homozygous.
Q.2 Which of the following is a detritivore?
Answer:Mushroom
Description: heterotrophs that obtain nutrients by decomposing plant and animal parts.Fungi are the primary decomposers in most environments, fungi produce the enzymes necessary to decompose lignin, a chemically complex substance found in wood.
Q.3 Which of the following could be a density-independent factor limiting human population growth?
Answer:Earthquake
Description:density-independent factor is factor limiting the size of a population whose effect is not dependent on the number of individuals in the population. An example of such a factor is an earthquake, which will kill all members of the population regardless of whether the population is small or large.
Q.4 Which of the following is the single most important cause of loss of biodiversity?
Answer: Habit loss
Description:Habitat destruction is Most important cause for biodiversity loss. Habitat loss is caused by deforestation, overpopulation, pollution and global warming. Species which are physically large and those living in forests or oceans are more affected by habitat reduction.
Q.5 Energy can be recycled within an ecosystem.
Answer:False
Description:Decomposers process large amounts of organic material and return nutrients to the ecosystem in inorganic form, which are then taken up again by primary producers.Energy is not recycled during decomposition It release as heat .
Q.6 In general smaller populations have less genetic diversity.
nswer: True
description: Genetic variation is determined by the joint action of natural selection and genetic drift .In small populations peoples have less genetic variation rresults less genetic diversity.
Q.7 Which of the following organisms would be most likely to accumulate toxins due to biological magnification?
Answer: Small fish
Description:Biological magnification occurs by increasing the toxicity of poisonous substances. These substances move up the food chain. Example of biological magnification- its dangers is any small fish that eats plankton that has been Compared with mercury. Hundreds of small fish might then contain just few parts of the mercury, not enough to cause major harm. On the image, the amount of mercury is measured in ppm-parts per million.A bird then might eat hundreds of the small fish, so that now instead of 200 ppm in a single fish, that bird has much higher levels of mercury. The toxin amplifies as it moves up the food chain.
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