Biology Forums - Study Force

1) SEE FIRST PHOTO ATTACHED TO ANSWER
Match the diagram with the correct term listed below.

          Structures                                                    Number
Homologous chromosomes                               Answer


    Sister chromatids                                             Answer


            Allele                                                            Answer


            Gene                                                             Answer




2) Descriptions of Some Structures Involved in Cell Division

1) Arrangement of stained chromosomes into homologous pairs from longest to shortest

2) Strands of DNA tightly coiled around histones

3) A specialized region on chromosomes where sister chromatids are joined together

4) Condensed DNA

                Description                                                           Number
              Chromosome                                                          Answer

              Chromatin                                                               Answer

              Karyotype                                                                 Answer

           Centromere                                                               Answer


3) DNA contains the genetic information that controls all processes of heredity in a cell. The total length of all DNA in the cells of a human body can stretch to the moon and back four times.

The terms that describe a length of DNA and the form in which it remains for most of its life, respectively are:

a.      Length of DNA                                                    Form in which it spends most of its time life
          Chromosome                                                                               Centromere

b.     Length of DNA                                                     Form in which it spends most of its time life
         Chromosome                                                                                     Chromatin

c.     Length of DNA                                                     Form in which it spends most of its time life
         Centromere                                                                                        Telomere

d.      Length of DNA                                                  Form in which it spends most of its time life
          Centromere                                                                                        Locus



4) Which of the following correctly describes the stages of the cell cycle?

a. Interphase, mitosis and cytokinesis

b. Mitosis and meiosis

c. Mitosis and cytokinesis

d. Interphase and cytokinesis


5) In a cell cycle

a. DNA and RNA are replicated and passed to parent cells during interphase

b. DNA is replicated and passed to daughter cells during mitotic phase

c. DNA and RNA are replicated and passed to sister chromatids during mitotic phase

d. DNA is replicated and passed to homologous chromosomes during interphase


6) When analyzing a normal human male karyotype, all of the chromosomes can be sorted into homologous pairs EXCEPT

a. X chromosomes

b. sex chromosomes

c. autosomal chromosome number 18

d. chromosome pair number 21


7) Which of the following statements does not correctly describe the characteristics of homologous chromosomes?

a. They contain the same genes.

b. The size and shape of the chromosomes are the same.

c. They contain identical alleles.

d. They have the centromeres located at the same spot.


8) SEE SECOND PHOTO ATTACHED TO ANSWER THESE QUESTION.

POSSIBLE ANSWERS: homologous chromosomes        or           sister chromatids
Structure A and B are                      Answer
 
.
Structure C and D are                     Answer


9) Autosomal homologous chromosomes

a. are joined at the centromere

b. have identical gene locations and alleles

c. consist of a copy of a paternal and a maternal chromosome

d. are the same size but different shape


10) The ploidy, and chromosome number of a cell that is 2n = 46 is:

a. Diploid and the chromosome number is 46

b. Diploid and the chromosome number is 23

c. Haploid and the chromosome number is 46

d. Haploid and the chromosome number is 96


11) What is the designation for a gamete with one copy of each homologous chromosome?

a. n

b. 3n

c. 2n



d. 46 chromosomes


12) A diploid organism has 18 chromosomes in its skin cells. Which of the following correctly describe the ploidy of this organism?

a. 2n = 36 and n = 18

b. All gametes contain nine pairs of chromosomes.

c. 2n = 18 and n = 9

d. All autosomal cells contain nine chromosomes.

Content hidden

Thanks but you forget 7,8

#7

They contain identical alleles.

Explanation: Homologous chromosomes have the same genes but don't have identical alleles. This means that the alleles will be different from one another in the homologous chromosomes.

#8

Structure A and B are sister chromatids.

Hope that helps

Thanks