Exam 4 Review Flashcards
The main advantage of sexual reproduction over asexual reproduction is the creation of genetic diversity among offspring. True or false.
True
Which division in meiosis is most similar to mitosis (in the sense that chromatids, not chromosomes, are being separated)?
Meiosis II
At the end of meiosis I, which of the following is true?
a. the two cells produced are haploid, with two chromatids per chromosome
b. the two cells produced are diploid, with two chromatids per chromosome
c. the two cells produced are haploid, with one chromatid per chromosome
d. the two cells produced are diploid, with one chromatid per chromosome
a. the two cells produced are haploid, with two chromatids per chromosome
In metaphase I of meiosis I, in what formation are the chromosomes held along the metaphase plate (center of the cell)?
a double line
Which phase of meiosis is characterized by homologous chromosomes experiencing crossing over (the swapping of genetic content)?
prophase I
The DNA of a cell is held in the form of chromatin until a cell enters mitosis (or meiosis), at which point it is tightly wound up into chromosomes. T/F
True
At the end of mitosis, the term used to refer to the splitting of the cytoplasm of a cell is cytokinesis. T/F
True
What phase of mitosis is characterized by the pulling apart of sister chromatids (due to the shortening of spindle fibers)?
anaphase
In the metaphase stage of mitosis, in what formation are the chromosomes held along the metaphase plate (center of the cell)?
a single line
What phase of mitosis is characterized by the condensation of chromosomes, the disappearance of nuclear membranes, and the appearance of spindle fibers?
prophase
The replication (copying) of the DNA of a cell occurs during the prophase stage of mitosis. T/F
False
The outcome of mitosis will be two new cells that are genetically identical to each other, and also to the original cell that produced them. T/F
True
Asexual reproduction can be much more energy-efficient than sexual reproduction. T/F
True
In a habitat with significant geologic diversity, some regions areas exist with very light exposed bedrock, and some regions exist with very dark exposed bedrock. A small rodent species living in this habitat has two different color (camouflage) variants that are currently being favored by natural selection: one with very light fur coloration and one with very dark fur coloration. Which of the following does this example describe?
a. directional selection
b. diversifying/disruptive selection
c. stabilizing selection
b. diversifying/disruptive selection
In which of the following should it be easiest to observe evolutionary change happening (in a relatively short period of time)?
a. a species with a short generation time, low genetic diversity, and a low mutation rate
b. a species with a long generation time, high genetic diversity, and a low mutation rate
c. a species with a short generation time, high genetic diversity, and a high mutation rate
d. a species with a long generation time, high genetic diversity, and a high mutation rate
c. a species with a short generation time, high genetic diversity, and a high mutation rate