Natural selection acts directly on
Natural selection acts directly on
Natural selection acts directly on
Fitness is a term often used by biologists to explain the evolutionary success of certain organisms. What would a biologist consider to be most important in determining if an organism "most fit"?
The wing of a bat, the flipper of a whale, and the forelimb of a cheetah appear very different, yet have the same basic bone pattern. These structures are examples of
What do you think happens among the lizards of a certain species when the food supply is limited?
The shaded areas of this diagram show where fossils of a specific organism were found on the continents of South America and Africa.
Darwin suggested that species with low fitness ______________, while species with high fitness ______________.
The ultimate source of all new alleles/ variation is
Some scientists use molecular evidence to study evolution. One type of molecular evidence is the DNA sequence or amino acid sequence of particular proteins in various species. Which of the following best describes what the study of these sequences reveals about the species?
It has been observed that organisms on different islands are closely related to similar organisms found on the nearest continent (large land mass).
This is taken as evidence that
Which of the following is a correct statement about the relationship between natural selection and evolution?
What are adaptations?
How do fossils demonstrate evidence of evolution?
A trait that results in low fitness to individual organisms in population will most likely:
What might have caused the change in distribution of crab color that was observed below?
Black is the original population and green is after 3 generations.
If a mutation introduces a new skin color in a lizard population, which factor might determine whether the frequency of the new allele will increase?
A storm blows through an area full of finches, and out of a population of 10,000 finches, 12 are blown by the storm onto a remote island. Why would the 12 finches on the island have a different gene pool than the large population of finches that they came from?
The geographic isolation of two populations of a species tends to increase differences between their gene pools because it:
Although they often live in the same habitat, the American toad breeds earlier in the spring than the Fowler’s toad does. What can be inferred from this information?
The two sources of genetic variation are
Hemophilia is an X-linked trait that is inherited recessively. How would you write the genotype of a man with hemophilia?
T - tall and t = short. In the Punnett square below, what belongs in the missing square (a)?
Having a Widow's Peak is dominant (W) over not having one (w). If parent A (Ww) and parent B (WW) have a child, what is the likelihood that the child will NOT have a widow's peak?
We can study chromosomes and genetic diseases by making a Karyotype, like the one pictured below. What information can you get from this karyotype?
A biological process is represented in the picture at right. Which of the following concepts is best illustrated by the diagram below?
One form of color blindness is an X-linked trait that is recessively inherited. If a man with normal color vision has a child with a woman who is a carrier for X-linked color blindness, what is the probability that they will have a child with color blindness?
The diagram below shows homologous chromosomes during prophase I of meiosis. Which of the following correctly describes the process being illustrated?
If a body cell in an animal has 32 chromosomes, the egg or sperm cell would contain:
Which of the following cell types is formed by meiosis?
What is one advantage of sexual reproduction?
The diagram below represents a biological process involving DNA.
What process is represented?
Lipids, carbohydrates, and DNA all exist in human cells as long molecular chains. Which of the following describes how DNA differs from lipids and carbohydrates?
For a new liver cell to form, DNA replication is necessary because it ensures that the newly formed cell has which of the following?
Chargaff observed that a sample of human DNA contained approximately 30% adenine and 20% guanine. Based on DNA structure, what are the expected percentages of the other nitrogenous bases in the sample?
The diagram below represents a small section of a DNA molecule. Which strand below shows the complementary (matching) bases?
A single nucleotide of DNA is composed of which of the following substances?
The sample of DNA below is being analyzed to determine if a patient has the genetic disorder. Determine the mRNA sequence from the patient’s DNA sequence.
Using the information in the genetic code chart, determine the amino acid sequence that is coded for by the mRNA sequence.
A small portion of an mRNA sequence is shown below.
AUGACUGGCUCA
Starting with the first base, how many codons does this portion of the sequence contain?
The diagram below represents structures and processes involved in protein synthesis in an animal cell. Four parts of the diagram are labeled W, X, Y, and Z.
Which part of the diagram represents transcription?
Which part of the cell cycle is when mitosis occurs?
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
Codominance | arrow_right_alt | single stranded nucleotide that codes for proteins |
genotype | arrow_right_alt | the series of events a cell goes through as it grows and divides |
mRNA | arrow_right_alt | genetic makeup of an organism |
cell cycle | arrow_right_alt | when both forms of a trait are seen in the phenotype |
Type of selection on polygenic traits when the average phenotype is favored.
