Biology chapter 13

Last update by mayur on 04/01/2014
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What is a karyotype?

A) the set of unique physical characteristics that define an individual

B) the collection of all the mutations present within a genome

C) a unique combination of chromosomes found in a gamete

D) a system of classifying cell nuclei

E) a display of every pair of homologous chromosomes within a cell, organized according to size and shape

Answer:
E) a display of every pair of homologous chromosomes within a cell, organized according to size and shape

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  • yosay
    Answered in Biology chapter 13

    By examining a karyotype, it is possible to determine


    A) which of two related plant forms is a gametophyte, and which is a sporophyte.


    B) the sex of an animal.


    C) the age of a fungus.


    D) A and B only


    E) A, B, and C

    D) A and B only
  • yosay
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    At which stage of mitosis are chromosomes photographed in the preparation of a karyotype?


    A) prophase


    B) metaphase


    C) anaphase


    D) telophase


    E) interphase

    B) metaphase
  • yosay
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    The human X and Y chromosomes are


    A) both present in every somatic cell of males and females alike.


    B) of approximately equal size.


    C) almost entirely homologous, despite their different names.


    D) called "sex chromosomes" because they determine an individual's sex.


    E) all of the above

    D) called "sex chromosomes" because they determine an individual's sex
  • yosay
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    If the liver cells of an animal have 24 chromosomes, how many chromosomes do its sperm cells have?


    A) 6


    B) 12


    C) 24


    D) 48


    E) 64

    B) 12
  • yosay
    Answered in Biology chapter 13

    Which of the following is true of a species that has a chromosome number of 2n = 16?

    A) The species is diploid with 32 chromosomes.

    B) The species has 16 sets of chromosomes.

    C) There are 8 homologous pairs.

    D) During the S phase of the cell cycle there will be 32 separate chromosomes.

    E) A gamete from this species has 4 chromosomes
    C) There are 8 homologous pairs.
  • yosay
    Answered in Biology chapter 13

    Which of the following is the term for a human cell that contains 22 pairs of autosomes and two X chromosomes?

    A) an unfertilized egg cell

    B) a sperm cell

    C) a male somatic cell

    D) a female somatic cell

    E) both A and D

    D) a female somatic cell
  • yosay
    Answered in Biology chapter 13

    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) all of the above

    C) II, III, and IV
  • yosay
    Answered in Biology chapter 13

    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.

    D) At sexual maturity, ovaries and testes produce diploid gametes by meiosis
  • yosay
    Answered in Biology chapter 13

    In animals, meiosis results in gametes, and fertilization results in

    A) spores.

    B) gametophytes.

    C) zygotes.

    D) sporophytes.

    E) clones.

    C) zygotes.
  • yosay
    Answered in Biology chapter 13

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

    A) sporophyte meiosis

    B) gametophyte mitosis

    C) gametophyte meiosis

    D) sporophyte mitosis

    E) alternation of generations

    B) gametophyte mitosis
  • yosay
    Answered in Biology chapter 13

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


    A) A grandparent and grandchild each have dark hair, but the parent has blond hair.


    B) A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte).


    C) A diploid animal produces gametes by meiosis, and the gametes undergo fertilization to produce a diploid zygote.


    D) A haploid mushroom produces gametes by mitosis, and the gametes undergo fertilization, which is immediately followed by meiosis.


    E) A diploid cell divides by mitosis to produce two diploid daughter cells, which then fuse to produce a tetraploid cell.

    B) A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte