Mastering BIO

Human gametes are produced by _____. meiosis the cell cycle mitosis asexual reproduction fertilization

meiosis

Imagine I've taken a snapshot of the chromosomes in a hypothetical cell. Two chromosomes lined up. You and your twin and your friends and her twin. Part of that snapshot looks like this. What stage of the lifecycle must that cell be in? the start of meiosis I just after meiosis I the start of mitosis just before mitosis the start of meiosis II

the start of meiosis I

If you look through a microscope and see a cell with chromosomes lined up two by two, what stage of cellular reproduction must you be looking at? mitosis only meiosis I only meiosis II only either mitosis or meiosis I either meiosis I or meiosis II

meiosis I only

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

the complete set of an organism's genes

What is crossing over? making an RNA copy of a DNA strand also referred to as the "independent assortment of chromosomes" a direct consequence of the separation of sister chromatids the movement of genetic material from one chromosome to a nonhomologous chromosome the exchange of homologous portions of nonsister chromatids

the exchange of homologous portions of nonsister chromatids

Imagine you found a hypothetical organism. You examine one of its gametes and you see that it contains 5 chromosomes. How many chromosomes will one of its body cells contain just before mitosis begins? 5 10 15 20 the answer cannot be determined

10

A diploid organism whose somatic (nonsex) cells each contain 32 chromosomes produces gametes containing _____ chromosomes. 8 30 64 16 32

16

Normal human gametes carry _____ chromosomes. 23 23 pairs of 5 46 46 pairs of

23

Which of the following is true of a species that has a chromosome number of 2n = 16? Each cell has eight homologous pairs. The species has 16 sets of chromosomes per cell. A gamete from this species has four chromosomes. The species is diploid with 32 chromosomes per cell. During the S phase of the cell cycle there will be 32 separate chromosomes.

Each cell has eight homologous pairs.

How are sister chromatids and homologous chromosomes different from each other? They are not different. Homologous chromosomes and sister chromatids are both identical copies of each other. Homologous chromosomes are closely associated with each other in both mitosis and meiosis. Sister chromatids are only associated with each other during mitosis. Homologous chromosomes are identical copies of each other. One sister chromatid comes from the father, and one comes from the mother. Sister chromatids are only formed during mitosis. Homologous chromosomes are formed during meiosis. Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication.

Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication.

What name is given to this process? To view the animation, click here. Then click on the image to start the animation. asexual reproduction sexual reproduction fertilization gametogenesis meiosis

asexual reproduction

lick on the diagram to view an animation. This animation illustrates the process of _____. centromere separation crossing over karyokinesis cytokinesis random fertilization

crossing over

Which of these gametes contains one or more recombinant chromosomes? A and C A and B B and C A and D D and E

B and C ; composed of material derived from both parents

Which of these cells is (are) haploid? B A and D D B and C C and D

C and D

Of the two processes we learned about which is going on in my hand right now mitosis meiosis gametogenesis both mitosis and meiosis none of the above

mitosis

What is the best evidence telling you whether this cell is diploid or haploid? The cell is diploid because it contains two sets of chromosomes. The cell is haploid because the chromosomes are not found in pairs. The cell is diploid because each chromosome consists of two chromatids.

The cell is diploid because it contains two sets of chromosomes.

This chromosome has two chromatids, joined at the centromere. What process led to the formation of the two chromatids? The two chromatids were formed by duplication of a chromosome. The two chromatids were formed by fertilization, bringing together maternal and paternal chromatids. The two chromatids were formed by synapsis and the formation of a synaptonemal complex.

The two chromatids were formed by duplication of a chromosome.

Here i am representing a duplicated chromosome. What structure is represented by my waist where I am joined to my twin? centrosome telomere chromosome centromere tetrad

centromere