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Q 1/72
Score 0
Normal human males develop from fertilized eggs containing which of the following sex chromosome combinations?
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XX
XO
XY
OO
Q 2/72
Score 0
The diploid number of chromosomes in a human skin cell is 46. The number of chromosomes found in a human egg cell is
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46
23
12.5
92
72 questions
Q.
Normal human males develop from fertilized eggs containing which of the following sex chromosome combinations?
1
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Q.
The diploid number of chromosomes in a human skin cell is 46. The number of chromosomes found in a human egg cell is
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A haploid cell is one that
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The process shown is
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The passing of traits from parents to offspring is called
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The scientific study of heredity is called
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An allele that is always expressed whenever it is present is called
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The phenotype of an organism
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If an individual possesses two recessive alleles for the same trait , the individual is said to be
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Tallness (T) is dominant to shortness (t) in pea plants. Which of the following represents a genotype of a pea plant that is heterozygous for tallness?
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In humans, having freckles (F) is dominant to not having freckles (j). The inheritance of these traits can be studied using a Punnett square similar to the one shown. The child represented in box 1 in the Punnett square would
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If a characteristic is sex-linked, the gene for it is found on
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a diagram in which several generations of a family and the occurrence of certain genetic characteristics are shown is called a
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Molecules of DNA are composed of long chains of
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A nucleotide consists of
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The amount of guanine in an organism always equals the amount of
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During DNA replication, a complementary strand of DNA is made from each original DNA strand. Thus, if a portion of the original strand is CCTAGCT, then the new strand will be
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Which of the following is not found in RNA?
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In RNA molecules, adenine is complementary to
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During transcription,
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Each nucleotide triplet in mRNA that specifies a particular amino acid is called a(n)
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Trisomy is a mutation that results in a cell having an extra
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Which disease is caused by a problem in the regulation of the cell cycle?
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What does evolution mean in biology?
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Which of the following is the result of artificial selection?
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Darwin's observations of finches indicated descent with
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The finches that Darwin studied differed in the shape of their beaks. According to Darwin, the finches probably
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Beak shape in finches is affected by the
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The major idea that Darwin presented in his book The Origin of Species was that
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The Galapagos finches are adapted to their environment because they have
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Natural selection is the process by which
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According to Darwin, evolution occurs
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Which of the following describes fossils?
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The similarity of these structures suggests that the organisms
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The formation of new species is called
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The age of Earth is estimated to be about
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A group of organisms of different species living together in a particular place is called a
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The process shown in the diagram is known as
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In biomes where precipitation is low, most organisms have adaptations to
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At least half of the world ' s species of land organisms live in a
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An area where fresh water from a river mixes with salt water from an ocean is a(n)
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The photosynthetic algae are
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The diagram, which shows how energy moves through an ecosystem, is known as a
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Leopard seals are
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Level A is composed of
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At each trophic level, the energy stored in the organisms in that level is about
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As a population reaches its carrying capacity, resources become more scarce. Which of the following would increase within the population?
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Which time period shows exponential growth of the population?
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During which time period are the birthrate and death rate equal?
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During which time period will the growth rate of the population be zero?
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The time period during which the rate of growth of a population would have a negative value is
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Which is a biotic factor that affects population size?
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As the density of a population increases, the effects of starvation and disease also often increase. These are which kind of factors?
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Better sanitation, hygiene, and disease control have had which effect on the human population?
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Vaccines have contributed to human population growth by
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The relationship shown in diagram 1 is
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The relationship shown in diagram 2 is
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The relationship shown in diagram 3 is
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Which of the following usually results when members of the same species require the same food and space?
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The American Revolution began in 1776. According to the graph, what was the approximate world population at that time?
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Renewable sources of energy
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Which resource is considered renewable?
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Coal is considered a nonrenewable resource because it
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Ozone in the atmosphere
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The heat-trapping ability of some gases in the atmosphere can be compared to
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The greenhouse effect
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Temperatures on Earth may continue to increase because
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The graph shows
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The extinction of species
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Which of these activities causes the greatest loss of biodiversity?
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Which of the following is not an effective way to reduce resource use?
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The steps needed to solve environmental problems include
