ch13 bio questions
Ignoring crossover, how many kinds of gametes can be produced by an organism with a diploid number of 8? ANSWER 8 4 32 2 16 I DON'T KNOW YET
16
The egg (ovum) of a rabbit contains 22 chromosomes. How many chromosomes are in the somatic (body) cells of a rabbit? ANSWER 132 88 11 44 22 I DON'T KNOW YET
44
__________ are a group of genetically identical individuals produced by a process called __________. ANSWER Clones; sexual reproduction Homologs; meiosis Gametes; asexual reproduction Clones; asexual reproduction Gametes; meiosis I DON'T KNOW YET
Clones; asexual reproduction
Regarding the role of cohesin protein in maintaining cohesion between sister chromatids, which of the following statements is false? ANSWER Correct During meiosis I, cohesion holds sister chromatids together along their lengths as chiasmata form between homologs. During meiosis I, cohesion holds sister chromatids together along their lengths as chiasmata form between homologs and during meiosis II, cohesion holds sister chromatids together along their lengths as the second meiotic spindle forms None of the listed responses is false. Cleavage of cohesins between sister chromatid arms at anaphase I allows homologs to separate. During meiosis II, cohesion holds sister chromatids together along their lengths as the second meiotic spindle forms.
During meiosis II, cohesion holds sister chromatids together along their lengths as the second meiotic spindle forms.
What is the result when a diploid cell undergoes meiosis? ANSWER Four haploid cells Two haploid cells and two diploid cells Four diploid cells Two diploid cells Two haploid cells I DON'T KNOW YET
Four haploid cells
Which of the following occurs in meiosis, but not mitosis? ANSWER Homologous chromosomes separate. The cells formed have the same combination of genes as found in the initial cell. The nuclear envelope disappears. Sister chromatids undergo disjunction. A spindle apparatus forms. I DON'T KNOW YET
Homologous chromosomes separate.
unless the chromosomes were stained to show band patterns, a karyotype would be least likely to show which of the following? ANSWER Part of a chromosome turned around. The attachment of a large part of a chromosome to another chromosome. A missing chromosome. A large part of a chromosome duplicated. An extra chromosome. I DON'T KNOW YET
Part of a chromosome turned around.
2 types of somatic cells
Skin and muscle
How many genes are present in the human genome? ANSWER 46 23 A virtually infinite number Tens of thousands Hundreds I DON'T KNOW YET
Tens of thousands
What is a locus? ANSWER A structure that appears during prophase I and consists of two paired genes. A cell with two chromosome sets. The precise location of a gene on a chromosome. A type of spore made only by fungi. I DON'T KNOW YET
The precise location of a gene on a chromosome.
Which of the following statements about homologous chromosomes is correct? ANSWER They are found in animal cells but not in plant cells. They pair up in prophase II. They have genes for the same traits at the same loci. They are found in haploid cells. They are found in the cells of human females but not in human males. I DON'T KNOW YET
They have genes for the same traits at the same loci.
Which of the following is a function of mitosis in humans? ANSWER Decreasing the number of chromosomes Multiplication of body cells Increasing genetic variability Production of eggs Production of sperm I DON'T KNOW YET
Which of the following is a function of mitosis in humans? ANSWER Decreasing the number of chromosomes Multiplication of body cells Increasing genetic variability Production of eggs Production of sperm I DON'T KNOW YET
The life cycle called __________ in plants has two multicellular stages: the __________ and the __________. ANSWER alternation of generations; diploid gametophyte; haploid sporophyte reduction division; haploid gametophyte; diploid sporophyte alternation of generations; haploid gametophyte; diploid sporophyte germ cell production; haploid gametophyte; diploid sporophyte reduction division; diploid gametophyte; haploid sporophyte I DON'T KNOW YET
alternation of generations; haploid gametophyte; diploid sporophyte
sexual reproduction, independent assortment, crossing over between nonsister chromatids of homologous chromosomes, and random fertilization
are all of the cells of the body except for the gametes and their precursors
Sister chromatids differ from nonsister chromatids in that sister chromatids __________. ANSWER always come from nonsister chromatids are never found in the paternal set are part of only the maternal set are part of nonhomologous chromosomal sets are products of the S phase of the cell cycle and are two copies of one chromosome I DON'T KNOW YET
are products of the S phase of the cell cycle and are two copies of one chromosome
A clone is the product of __________. ANSWER Correct asexual reproduction and mitosis sexual reproduction sexual reproduction and meiosis asexual reproduction mitosis meiosis I DON'T KNOW YET
asexual reproduction and mitosis
Somatic cells in humans differs from gametes in that human somatic cells __________. ANSWER contain two sets of each of the 23 chromosome types are always haploid are important in sexual reproduction replicate by a process called meiosis do not contain sex chromosomes I DON'T KNOW YET
contain two sets of each of the 23 chromosome types
Regardless of whether an organism is an animal, a plant, a fungus, or an algal cell, all zygotes are __________ and are formed during the __________ of two __________ gametes. ANSWER clones; mitotic division; diploid None of the listed responses is correct because only animals have zygotes. haploid; fertilization; diploid diploid; fertilization; haploid clones; meiotic division; diploid I DON'T KNOW YET
diploid; fertilization; haploid
Darwin realized the importance of heritable variation to evolution __________. ANSWER and incorporated Gregor Mendel's work into his writings by studying Gregor Mendel's work None of the listed responses is correct. even though he never read any of Gregor Mendel's work and incorporated Gregor Mendel's work into his writings without giving Mendel credit for his ideas I DON'T KNOW YET
even though he never read any of Gregor Mendel's work
A life cycle in which the only multicellular form is haploid is most typical of __________. ANSWER fish plants protists primates fungi I DON'T KNOW YET
fungi
Allelic variation is an important source of __________ in a population. ANSWER genetic diversity mitosis asexual reproduction None of the listed responses is correct. clonal diversity
genetic diversity
A pair of genetic structures carrying genes that control the same inherited characters are called __________. ANSWER nonsister chromatids clones homologous chromosomes sister chromatids autosomes zygotes I DON'T KNOW YET
homologous chromosomes
Characteristic of the bdelloid rotifer is that it __________. ANSWER produces diploid gametes is more plantlike and therefore undergoes alternation of generation has never experienced genetic diversity is fungus-like and therefore haploid is an example of an animal that has not reproduced sexually in 40 million years I DON'T KNOW YET
is an example of an animal that has not reproduced sexually in 40 million years
The major contribution of sex to evolution is that __________. ANSWER Correct it provides a way in which somatic mutations can be inherited it is the only mechanism for species to reproduce it provides a method to increase genetic variation and it is the only mechanism for species to reproduce it provides a method to increase genetic variation it is the only mechanism for species to reproduce and it provides a way in which somatic mutations can be inherited I DON'T KNOW YET
it provides a method to increase genetic variation
The process called __________ reduces the chromosome number by __________. ANSWER mitosis; two consecutive cell divisions meiosis; two consecutive cell divisions meiosis; dividing without chromosome duplication mitosis; destroying one set of information prior to division mitosis; dividing without chromosome duplication
meiosis; two consecutive cell divisions
In meiosis, __________ of __________ cross over and form __________. ANSWER nonsister chromatids; homologous pairs; chiasmata nonhomologs; nonhomologous pairs; cohesion sister chromatids; nonhomologous pairs; chiasmata nonsister chromatids; nonhomologous pairs; chiasmata sister chromatids; homologous pairs; chiasmata I DON'T KNOW YET
nonsister chromatids; homologous pairs; chiasmata
The zipper-like complex that forms in meiosis occurs during __________ and is called the __________. ANSWER prophase II; meiotic complex prophase I; centromeric complex metaphase I; synaptonemal complex prophase I; synaptonemal complex metaphase II; meiotic complex
prophase I; synaptonemal complex
Genetic diversity requires __________. ANSWER sexual reproduction, independent assortment, crossing over between nonsister chromatids of homologous chromosomes, and random fertilization asexual reproduction, independent assortment, crossing over between nonsister chromatids of homologous chromosomes, and random fertilization sexual reproduction, nonindependent assortment, crossing over between nonsister chromatids of homologous chromosomes, and random fertilization asexual reproduction, independent assortment, crossing over between sister chromatids of homologous chromosomes, and random fertilization sexual reproduction, independent assortment, crossing over between sister chromatids of homologous chromosomes, and nonrandom fertilization I DON'T KNOW YET
sexual reproduction, independent assortment, crossing over between nonsister chromatids of homologous chromosomes, and random fertilization
Somatic cells in humans contain __________ set(s) of chromosomes and are therefore termed __________. ANSWER one; haploid two; diploid two; haploid one; diploid three; triploid I DON'T KNOW YET
two; diploid
At the end of mitosis, __________ daughter cells that are genetically __________ are formed, while at the end of meiosis, __________ daughter cells that are genetically __________ are formed. ANSWER two; distinct; four; identical four; distinct; two; identical two; identical; two; distinct two; identical; four; distinct four; identical; two; distinct I DON'T KNOW YET
two; identical; four; distinct
