quiz 13 – Flashcards

Which of the following defines a genome? a. representation of a complete set of a cell's polypeptides b. the complete set of an organism's polypeptides c. the complete set of a species polypeptides d. a karyotype e. the complete set of an organism's genes

At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype? a. prophase b. metaphase c. anaphase d. telophase

Which of the following is true of a species that has a chromosome number of 2n=16? a. the species is a diploid with 32 chromosomes per cell b. the species has 16 set of chromosomes per cell c. each cell has eight homologous pairs d. during the s phase of the cell cycle there will be 32 spirit chromosomes e. a gamete from this species has four chromosomes

Eukaryotic sexual life cycles show tremendous variation. Of the following elements, which do all sexual life cycles have in common? I. Alternation of generations II. Meiosis III. Fertilization IV. Gametes V. Spores A) I, IV, and V B) I, II, and IV C) II, III, and IV D) II, IV, and V E) I, II, III, IV, and V

Which of these statements is false? A) In humans, each of the 22 maternal autosomes has a homologous paternal chromosome. B) In humans, the 23rd pair, the sex chromosomes, determines whether the person is female (XX) or male (XY). C) Single, haploid (n) sets of chromosomes in ovum and sperm unite during fertilization, forming a diploid (2n), single-celled zygote. D) At sexual maturity, ovaries and testes produce diploid gametes by meiosis. E) Sexual life cycles differ with respect to the relative timing of meiosis and fertilization.

Sister chromatids are separated from each other during a. metaphase I b. anaphase I c. telophase II d. anaphase II

Which of the following best describes a karyotype? A) a pictorial representation of all the genes for a species B) a display of each of the chromosomes of a single cell C) the combination of all the maternal and paternal chromosomes of a species D) the collection of all the chromosomes in an individual organism E) a photograph of all the cells with missing or extra chromosomes

After telophase I of meiosis, the chromosomal makeup of each daughter cell is A) diploid, and the chromosomes are each composed of a single chromatid. B) diploid, and the chromosomes are each composed of two chromatids. C) haploid, and the chromosomes are each composed of a single chromatid. D) haploid, and the chromosomes are each composed of two chromatids. E) tetraploid, and the chromosomes are each composed of two chromatids.

A given organism has 46 chromosomes in its karyotype. We can therefore conclude which of the following? A) It must be human. B) It must be a primate. C) It must be an animal. D) It must be sexually reproducing. E) Its gametes must have 23 chromosomes.

Independent assortment of chromosomes occurs. A) The statement is true for mitosis only. B) The statement is true for meiosis I only. C) The statement is true for meiosis II only. D) The statement is true for mitosis and meiosis I. E) The statement is true for mitosis and meiosis II.

Which of the following occurs in meiosis but not in mitosis? A) chromosome replication B) synapsis of chromosomes C) production of daughter cells D) alignment of chromosomes at the equator E) condensation of chromatin

If a diploid organism has a genome consisting of 4 pairs of chromosomes, it can produce ____ different combinations of maternal and paternal chromosomes (disregarding crossing over). a. 4 b. 8 c. 12 d. 16

A tetrad includes which of the following sets of DNA strands? A) two single-stranded chromosomes that have synapsed B) two sets of sister chromatids that have synapsed C) four sets of sister chromatids D) four sets of unique chromosomes E) eight sets of sister chromatids

Three of the four choice listed below concern cells with two chromosome sets. Select the exception. a. zygote b. somatic cells c. gamete d. diploid

Three of the four choice listed below are characteristics of meiosis. Select the exception. a. Involves two divisions b. reduces the number of chromosomes c. results in producing genetically identical cells d. produces haploid cells

The essence of meiosis is that a. gametes receive one copy of each member of each pair of homologous chromosomes b. diploid gametes are formed c. each gamete receives one member of each pair of homologous chromosomes d. each gamete receives one member of each pair of homologous chromosomes and haploid gametes are formed