Chapter 13- Meiosis and Sexual Life Cycles

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If a horticulturist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of the following would be her most probable and efficient route to establishing a line of such plants?

Clone the plant asexually to produce an identical one

The human genome is minimally contained in which of the following?

every human cell

In the human species, all somatic cells have 46 chromosomes. Which of the following can also be true?

A plant species (privet shrubs) has 46 chromosomes per cell

Which of the following is a true statement about sexual vs. asexual reproduction?

In sexual reproduction, individuals transmit 50% of their genes to each of their offspring

Which of the following defines a genome?

the complete set of an organism's genes

At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?


The human X and Y chromosomes

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?

Each cell has eight homologous pairs

Eukaryotic sexual life cycles show tremendous variation. Of the following elements, which do all sexual life cycles have in common?

II, III, and IV

II. Meiosis
III. Fertilization
IV. Gametes

Which of these statements is false?

At sexual maturity, ovaries and testes produce diploid gametes by meiosis

Referring to a plant's sexual life cycle, which of the following terms describes the process that leads directly to the formation of gametes?

gametophyte mitosis

Which of the following is an example of alternation of generations?

A diploid plant (sporophyte) produces, by 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 error would be a mistake in which of the following?

either anaphase I or II

A given organism has 46 chromosomes in its karyotype. We can therefore conclude which of the following?

Its gametes must have 23 chromosomes

A triploid cell contains three sets of chromosomes. If a cell of a usually diploid species with 42 chromosomes per cell is triploid, this cell would be expected to have which of the following?

63 chromosomes in 21 sets of 3

A karyotype results from which of the following?

the ordering of human chromosome images

Which of the following best describes a karyotype?

a display of each of the chromosomes of a single cell

If a cell has completed the first meiotic division and is just beginning meiosis II, which of the following is an appropriate description of its contents?

It has half the amount of DNA as the cell that began meiosis

Which of the following can utilize both mitosis and meiosis in the correct circumstances?

a plantlike protist

Which of the following might result in a human zygote with 45 chromosomes?

an error in either egg or sperm meiotic anaphase

The somatic cells of a privet shrub each contain 46 chromosomes. To be as different as they are from human cells, which have the same number of chromosomes, which of the following must be true?

Genes of privet chromosomes are significantly different than those in humans

In a human karyotype, chromosomes are arranged in 23 pairs. If we choose one of these pairs, such as pair 14, which of the following do the two chromosomes of the pair have in common?

Length, centromere position, staining pattern, and traits coded for by their genes

After telophase I of meiosis, the chromosomal makeup of each daughter cell is

haploid, and the chromosomes are each composed of two chromatids

How do cells at the completion of meiosis compare with cells that have replicated their DNA and are just about to begin meiosis?

They have half the number of chromosomes and one-fourth the amount of DNA

When does the synaptonemal complex disappear?

late prophase of meiosis I

Which of the following happens at the conclusion of meiosis I?

Homologous chromosomes are separated

A cell divides to produce two daughter cells that are genetically different

The statement is true for meiosis I only

Chromatids are separated from each other

The statement is true for mitosis and meiosis II

Independent assortment of chromosomes occurs

The statement is true for meiosis I only

Which of the following occurs in meiosis but not in mitosis?

synapsis of chromosomes

If an organism is diploid and a certain gene found in the organism has 18 known alleles (variants), then any given organism of that species can/must have which of the following

at most, 2 alleles for that gene

Whether during mitosis or meiosis, sister chromatids are held together by proteins referred to as cohesins. Such molecules must have which of the following properties?

They must be removed before anaphase can occur

Experiments with cohesins have found that

cohesins are protected from cleavage at the centromere during meiosis I

) A tetrad includes which of the following sets of DNA strands?

two sets of sister chromatids that have synapsed

When we see chiasmata under a microscope, that lets us know which of the following has occurred?

prophase I

To view and analyze human chromosomes in a dividing cell, which of the following is/are required?

DNA stain and a light microscope

To visualize and identify meiotic cells at metaphase with a microscope, what would you look for?

tetrads all aligned at the cell's center

Tetrads of chromosomes are aligned at the equator of the spindle; alignment determines independent assortment.

Metaphase I

Synaptonemal complexes form or are still present.

Prophase I

Centromeres of sister chromatids disjoin and chromatids separate.

Anaphase II

Which of the steps takes place in both mitosis and meiosis?


How does the sexual life cycle increase the genetic variation in a species?

by allowing crossing over

For a species with a haploid number of 23 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes?

about 8 million

Independent assortment of chromosomes is a result of

the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I

Which of the following best describes the frequency of crossing over in mammals?

at least 1-2 per chromosome pair

When homologous chromosomes crossover, what occurs?

Specific proteins break the two strands and re-join them with their homologs

Which of the life cycles is typical for animals?

I only

Which of the life cycles is typical for plants and some algae?

III only

Which of the life cycles is typical for most fungi and some protists?

II only

In part III of Figure 13.1, the progression of events corresponds to which of the following series?

sporophyte, meiosis, spore, mitosis, gametophyte, mitosis, gametes, fertilization

In a life cycle such as that shown in part III of Figure 13.1, if the zygote's chromosome number is 10, which of the following will be true?

The sporophyte's chromosome number per cell is 10 and the gametophyte's is 5

Which diagram represents anaphase I of meiosis?


Which diagram(s) represent anaphase II of meiosis?

V only

Which sample of DNA might be from a nerve cell arrested in G0 of the cell cycle?


Which sample might represent an animal cell in the G2 phase of the cell cycle?


Which sample might represent a zygote?


A certain female's number 12 chromosomes both have the blue gene and number 19 chromosomes both have the long gene. As cells in her ovaries undergo meiosis, her resulting eggs (ova) may have which of the following?

one chromosome 12 with one blue gene and one chromosome 19 with one long gene

If a female of this species has one chromosome 12 with a blue gene and another chromosome 12 with an orange gene, and has both number 19 chromosomes with short genes, she will produce which of the following egg types?

one-half blue short and one-half orange short gene eggs

A female with a paternal set of one orange and one long gene chromosome and a maternal set comprised of one blue and one short gene chromosome is expected to produce which of the following types of eggs after meiosis?

Each egg has a one-fourth chance of having either blue long, blue short, orange long, or orange short combinations

Since the rotifers develop from eggs, but asexually, what can you predict?

No males can be found

Assuming that the eggs are diploid, tetraploid, or partially tetraploid, what mechanism may still occur without fertilization?

crossing over of homologs

In these asexual rotifers, how does variation occur without meiosis and fertilization?

Variation is caused by mutation and maintained by selection

How is natural selection related to sexual reproduction as opposed to asexual reproduction?

Sexual reproduction results in many new gene combinations, some of which will lead to differential reproduction

A human cell containing 22 autosomes and a Y chromosome is

a sperm

Which life cycle stage is found in plants but not animals?

multicellular haploid

Homologous chromosomes move toward opposite poles of a dividing cell during

meiosis I

Meiosis II is similar to mitosis in that

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


If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of a single cell at metaphase of meiosis II would be


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)?


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