WGU C190 Preparation questions with verified
answers
_____ is an example of an abiotic factor while _____ is an example of a biotic
factor. Ans✓✓✓-D. Temperature ... bacteria
A diploid cell is in G1 phase of the cell cycle. What would you observe in this cell?
(Select 2) Ans✓✓✓-Homologous chromosomes
C. Chromosomes composed of a single chromatid
A flock of white egrets follows a herd of wild horses around the prairie. As the
horses graze, they dig their hooves into the soil, exposing insects and worms. The
egrets consume the insects and worms as they follow the horses. The egrets
benefit from this relationship because they have an easier time finding food. The
horses appear to be unaffected. The relationship between the horses and the
egrets is an example of _____ . Ans✓✓✓-D. commensalism
A homozygous tall pea plant is crossed with a heterozygous tall pea plant. What
are the phenotypic and genotypic ratios of the potential offspring? Ans✓✓✓-D.
100% tall phenotype, 50% heterozygous genotype
A population of moths in England has light colored individuals and dark colored
individuals. The moths are frequently found on light colored trees. Prior to
industrialization, the lighter moths had higher fitness than the darker moths
because they blended in better with the light bark, and predators could not see
them as well. Once factories and industries started producing pollution, dark soot
covered the trees with light bark, making them darker. What effect would this
environmental change most likely have on the population? Ans✓✓✓-B. Darker
moths will be more likely to survive and reproduce.
, A variation in the nucleotide sequence of a gene in the DNA will always result in
_____ . Ans✓✓✓-A. a change in the mRNA codon
According to the cladogram, which statement correctly describes organisms that
share homologous features? Ans✓✓✓-B. Giant Panda and Dog share similar ear
structure.
All Siamese cats are born with pale fur, but within the first few weeks, the ears,
nose, paws, and tail turn dark. They have the genotype for dark fur in their entire
body. But the enzyme that produces the dark pigment is inactive at temperature
above 93°F. Since the ears, nose, paws, and tail become cooler than the rest of
the body once they are born, dark pigment is produced in those areas. How can
we explain this? Ans✓✓✓-B. The environment influences the expression of
genes.
Although not particularly abundant, elephants play an important role in the
African Savannahs. When elephants knock down trees and eat shrubs, they
provide critical support of other species. Felling trees and eating brush maintain
resources for and allow grasslands to flourish. This provides food for Africa's
herbivores and, in turn, food for the carnivores. Also, it creates spaces to burrow
for small animals. Some seeds that are excreted in elephant dung can have up to
400% greater chance of germination and provide food sources for many species -
including people. Based on this information, elephants in the savanna are most
likely _____ . Ans✓✓✓-B. keystone species
As winter progresses, ice will form and stay at the surface of a pond as it thickens
throughout the season. Which property of water allows this to happen?
Ans✓✓✓-D. Hydrogen bonds between water molecules become more stable,
and molecules spread out as the temperature decreases causing water to become
less dense.
answers
_____ is an example of an abiotic factor while _____ is an example of a biotic
factor. Ans✓✓✓-D. Temperature ... bacteria
A diploid cell is in G1 phase of the cell cycle. What would you observe in this cell?
(Select 2) Ans✓✓✓-Homologous chromosomes
C. Chromosomes composed of a single chromatid
A flock of white egrets follows a herd of wild horses around the prairie. As the
horses graze, they dig their hooves into the soil, exposing insects and worms. The
egrets consume the insects and worms as they follow the horses. The egrets
benefit from this relationship because they have an easier time finding food. The
horses appear to be unaffected. The relationship between the horses and the
egrets is an example of _____ . Ans✓✓✓-D. commensalism
A homozygous tall pea plant is crossed with a heterozygous tall pea plant. What
are the phenotypic and genotypic ratios of the potential offspring? Ans✓✓✓-D.
100% tall phenotype, 50% heterozygous genotype
A population of moths in England has light colored individuals and dark colored
individuals. The moths are frequently found on light colored trees. Prior to
industrialization, the lighter moths had higher fitness than the darker moths
because they blended in better with the light bark, and predators could not see
them as well. Once factories and industries started producing pollution, dark soot
covered the trees with light bark, making them darker. What effect would this
environmental change most likely have on the population? Ans✓✓✓-B. Darker
moths will be more likely to survive and reproduce.
, A variation in the nucleotide sequence of a gene in the DNA will always result in
_____ . Ans✓✓✓-A. a change in the mRNA codon
According to the cladogram, which statement correctly describes organisms that
share homologous features? Ans✓✓✓-B. Giant Panda and Dog share similar ear
structure.
All Siamese cats are born with pale fur, but within the first few weeks, the ears,
nose, paws, and tail turn dark. They have the genotype for dark fur in their entire
body. But the enzyme that produces the dark pigment is inactive at temperature
above 93°F. Since the ears, nose, paws, and tail become cooler than the rest of
the body once they are born, dark pigment is produced in those areas. How can
we explain this? Ans✓✓✓-B. The environment influences the expression of
genes.
Although not particularly abundant, elephants play an important role in the
African Savannahs. When elephants knock down trees and eat shrubs, they
provide critical support of other species. Felling trees and eating brush maintain
resources for and allow grasslands to flourish. This provides food for Africa's
herbivores and, in turn, food for the carnivores. Also, it creates spaces to burrow
for small animals. Some seeds that are excreted in elephant dung can have up to
400% greater chance of germination and provide food sources for many species -
including people. Based on this information, elephants in the savanna are most
likely _____ . Ans✓✓✓-B. keystone species
As winter progresses, ice will form and stay at the surface of a pond as it thickens
throughout the season. Which property of water allows this to happen?
Ans✓✓✓-D. Hydrogen bonds between water molecules become more stable,
and molecules spread out as the temperature decreases causing water to become
less dense.
