Ch 13 Flashcards
What is a genome?
A) the complete compliment of an organism’s genes.
which of the following statements about genes is incorrect?
D) one gene only is used in a specific cell type.
Asexual reproduction and sexual reproduction differ in all but which of the following ways?
E) asexual reproduction is utilized only by fungi and protists, whereas sexual reproduction is utilized only by plants and animals.
If a horticulturist breeding gardenias succeeds in having a single plant with particularly desirable set of traits, which of the following would be her most probable and efficient route to establishing a lot of plants?
C) Clone that plant asexually to produce an identical one
Asexual reproduction results in identical offspring unless which of the of the following occurs?
D) mutation
The human genome is minimally contained in which of the following?
A) every human cell
A gene is location along a chromosome is known as which of the following?
C) locus
What is a karyotype?
E)A display of every pair of homologous chromosomes within a cell, organized according to size and shape
At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
B) metaphase
The human X and Y chromosomes
D) D) include genes that determine an individual’s sex
Which of the following is true of a species that has a chromosome number of 2n = 16?
C) each cell has eight homologous pairs
Eukaryotic sexual life cycle show tremendous variation. Of the following elements, which do all sexual life cycles have in common? I. Alteration of generations II. Meiosis III. Fertilization IV. Gametes V. Spores
C) II, III, and IV
Which of these statements is false?
D) at sexual maturity, ovaries and testes produce diploid gametes by meiosis.
And animals, meiosis results in gametes, and fertilization results in
C) zygotes
Referring to a plant sexual life cycle, which of the following terms describes the process that leads directly to the formation of gametes?
B) gametophyte mitosis
Which of the following is an example of alteration of generations?
B) a diploid plan (sporophyte) produces, but I’m meiosis, a spore that gives rise to a multicellular, Haploid pollen grain (gametophyte).
The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this era would be a mistake and which of the following?
E) either anaphase one or two
A given organism has 46 chromosomes and it’s Cara type. We can therefore conclude which of the following?
E) its gametes must have 23 chromosomes.
A karyotype results from which of the following?
C) the ordering of human chromosome images
After tela phase 1 of meiosis, the commas I’m a make up of each daughter cell is
D) haploid, and the chromosomes are each composed of two chromatids.
When does the synaptonemal complex disappear?
A) wait prophase of meiosis one
Which of the following happens at the conclusion of meiosis one?
A) homologous chromosomes are separated
Chaismata are what we see under a microscope that let us know which of the following is occurring?
D) crossing over
How does the sexual life cycle increase the genetic variation of a species?
A) by allowing independent assortment of chromosomes
For species with the haploid number of 23 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes?
E) about 8 million
Independent assortment of chromosomes is a result of
A) the random an independent way in which each pair of Magus chromosomes line up at the metaphase plate during meiosis one.
When pairs of homologous chromosomes separate during anaphase I,
B) the sister chromatids remain attached to one another.
Natural selection and recombination dude crossing over during meiosis I are related and which of the following ways?
D) recombinants may have combinations of traits that are favored by natural selection.
A human cell containing 22 artisans and a Y chromosome is
A) a sperm.
Which lifecycle stage is found in plants but not animals?
D) multicellular haploid
I’m August chromosomes move toward opposite poles of a dividing cell during
B) meiosis I.
Meiosis II is similar to mitosis in that
A) sister chromatids separate during anaphase.
If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at metaphase of meiosis I would be
D) 2x.
If we continue to follow the cell lineage for the previous question, then the DNA content of a single cell at metaphase of meiosis II would be
C) x.
How many different combinations of maternal and paternal chromosomes can be packaged in gametes made by an organism with a diploid number of 8(2n = 8)?
D) 16
