Chapter 13 BIO DSM

Ace your homework & exams now with Quizwiz!

__________ are a group of genetically identical individuals produced by a process called __________.

Clones; asexual reproduction

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

Multicellular haploid

The life cycle called __________ in plants has two multicellular stages: the __________ and the __________.

alternation of generations; haploid gametophyte; diploid sporophyte

Somatic cells in animals differ from gametes in that somatic cells __________.

are all of the cells of the body except for the gametes and their precursors

Ignoring crossover, how many kinds of gametes can be produced by an organism with a diploid number of 8?

16

The egg (ovum) of a rabbit contains 22 chromosomes. How many chromosomes are in the somatic (body) cells of a rabbit?

44

Regarding the role of cohesin protein in maintaining cohesion between sister chromatids, which of the following statements is false? - Cleavage of cohesins between sister chromatid arms at anaphase I allows homologs to separate. - None of the listed responses is false. - During meiosis II, cohesion holds sister chromatids together along their lengths as the second meiotic spindle forms. - During meiosis I, cohesion holds sister chromatids together along their lengths as chiasmata form between homologs and cleavage of cohesins between sister chromatid arms at anaphase I allows homologs to separate. - 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 - During meiosis I, cohesion holds sister chromatids together along their lengths as chiasmata form between homologs.

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?

Four haploid cells

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

Homologous chromosomes separate.

Which of the following is a function of mitosis in humans?

Multiplication of body cells

Unless the chromosomes were stained to show band patterns, a karyotype would be least likely to show which of the following?

Part of a chromosome turned around.

What is a locus?

The precise location of a gene on a chromosome.

Which of the following statements about homologous chromosomes is correct?

They have genes for the same traits at the same loci.

Sister chromatids differ from nonsister chromatids in that sister chromatids __________.

are products of the S phase of the cell cycle and are two copies of one chromosome

A clone is the product of __________.

asexual reproduction and mitosis

Somatic cells in humans differs from gametes in that human somatic cells __________.

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.

diploid; fertilization; haploid

Darwin realized the importance of heritable variation to evolution __________.

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 __________.

fungi

Allelic variation is an important source of __________ in a population.

genetic diversity

A pair of genetic structures carrying genes that control the same inherited characters are called __________.

homologous chromosomes

Characteristic of the bdelloid rotifer is that it __________.

is an example of an animal that has not reproduced sexually in 40 million years

The major contribution of sex to evolution is that __________.

it provides a method to increase genetic variation

The process called __________ reduces the chromosome number by __________.

meiosis; two consecutive cell divisions

In meiosis, __________ of __________ cross over and form __________.

nonsister chromatids; homologous pairs; chiasmata

The zipper-like complex that forms in meiosis occurs during __________ and is called the __________.

prophase I; synaptonemal complex

Genetic diversity requires __________.

sexual reproduction, independent assortment, crossing over between nonsister chromatids of homologous chromosomes, and random fertilization

How many genes are present in the human genome?

tens of thousands

Somatic cells in humans contain __________ set(s) of chromosomes and are therefore termed __________.

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.

two; identical; four; distinct


Related study sets

Chapter 3: Biological Molecules-- The Carbon Compounds of Life

View Set

Ch 16 Exercise Prescription for Health and Fitness

View Set

Chapter 13. D.C. General Biology

View Set

Accounting 206 McGraw-Hill Video Lecture & Assessment LO 2-5, 6, 7

View Set