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Biology Exam 4 Study guide
Terms in this set (50)
Which of the following descriptions correctly defines a genome?
The complete set of an organism
Where do the microtubules of the spindle originate during mitosis in animal cells?
Humans produce skin cells by mitosis and gametes by meiosis. The nuclei of skin cells produced by mitosis will have?
Twice as much as DNA as the nuclei of gametes produced by meiosis
During mitosis in animal cells, at which phase do centrioles begin to move apart?
At which phase of mitosis do the sister chromatids become daughter chromosomes?
At which phase of mitosis do the sister chromatids appear aligned in the center of the cell?
At which phase of mitosis does the nuclear envelope diaper and nuclear material condense?
Which image displays the chromosomal composition of one daughter nucleus at telophase of mitosis?
What is the correct chromosomal condition for the nucleus at prophase of mitosis?
What is the correct chromosomal condition for a nucleus in G1 of the cell division cycle?
Which of these statements is true?
In humans, the 23rd pair, the sex chromosomes, determines whether the person is female (XX) or male (XY)
Which of the following types of cells would be produced by meiosis?
A haploid animal cell
Which of these is a way that the sexual life cycle increases genetic variation in a species?
by allowing crossing over
Homologous chromosomes are aligned at the metaphase plate (equator)
Homologous chromosomes disjoin and chromatids separate
Sister chromatids disjoin and chromatids separate
Sister chromatids are aligned at the metaphase plate
Mitosis is most similar to
Which of these steps take(s) place in both mitosis and meiosis?
3: Separation of sister chromatids
Which of the steps take(s) place in metaphase of meiosis I?
2: Alignment of homologous chromosomes at the metaphase plate
Which of the steps take(s) place in anaphase of meiosis I?
4: Separation of the homologs; no uncoupling of the centromere
Refer to the drawings in figure 4.2 of a single pair of homologous chromosomes as they might appear during various stages of either mitosis or meiosis. Which diagram represents anaphase I of meiosis?
Refer to the drawings in figure 4.2 of single pair o homologs chromosomes as they might appear during various stages of either mitosis or meiosis. Which diagram represents anaphase II of meiosis?
Refer to the drawings in figure 4.2 of a single pair of homologous chromosomes as they might appear during various stages of either mitosis or meiosis. Which diagram represents anaphase of mitosis?
what do we mean when we use the term monohybrid cross
A monohybrid cross involves organisms that are heterozygous for one character
what do we mean when we use the term dihybrid cross?
A dihybrid cross involves organisms that are heterozygous for two characters
how many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?
In the cross AaBbCc x AaBbCc, what is the probability of producing the genotype AABBCC?
Given the following cross between parents of the genotypes AABBCc x AabbCc, assume simple dominance for each trait and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?
In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (CRCr) offspring of red (CRCR) and white (CrCr) homozygotes. This is the result of what?
Which of the following describes the ability of a single gene to have multiple phenotypic effects?
Which of the boxes marked 1-4 correspond(s) to plants with dark leaves?
1,2, and 3
Which of the boxes correspond(s) to plants with heterozygous genotype?
2 and 3
Which of the plants will be true-breeding?
1 and 4 only
Males are more often affected by sex-linked traits than females because
males are hemizygous for the X chromosome
One map unit is equivalent to which of the following values?
1% frequency of recombination between two genes
which of the following events causes recombination between linked genes to occur?
Cross over between these genes result in chromosomal exchange
What is the reason that closely linked genes are typically inherited together?
The likelihood of a crossover event between these two genes is low.
A translocation causes which of the following results?
Exchange of non homologous chromosome fragments
of the following human aneuploidies, which is the one that can generally have the most severe impact on the health of the individual?
Down syndrome has a frequency in the U.S. population of ~1/830 live births. in which of the following groups would you expect this frequency to be significantly higher?
No groups have a significantly higher frequency
A couple has a child with Down syndrome. The mother is 39 years old at the time of delivery. Which of the following is the most probable cause of the Child's condition?
one member of he couple underwent nondisjunction in gamete production
cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?
Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of nucleotides in this sample will be guanine?
Which enzyme catalyzes the elongating of a DNA strand in the 5'-> 3' direction?
DNA polymerase III
What is the role of DNA ligase in the elongation of the lagging strand during DNA replication?
it joins Okazaki fragment together
What is the function of topoisomerase?
Reliving strand in the DNA ahead of the replication fork
During DNA replication, which of the following enzymes separates the DNA strands during replication?
During DNA replication, which of the following enzymes covalently connects segments of DNA?
Which of the following enzymes synthesizes short segments of RNA
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