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Honors Biology
Unit 11
Name: _________________________
HW2: Homologous Pairs of Chromosomes
The following drawing is a homologous pair of chromosomes. Use the letters above each chromatid
to answer the following questions.
A
B
C
D
______ 1) If the first homolog (A & B) is maternal, what is the second homolog?
a) maternal also
c) paternal, it comes from the father
b) paternal, it comes from the mother
d) a sister chromatid
______ 2) Which of the above chromatids are most likely genetically identical to each
other?
a. A and B
b. B and C
c. B and D
d. A and D
______ 3) Which of the following is a similarity between the two homologs above? (fill in
all that apply)
a. They both have the same centromere position
b. They both have the same nucleotide sequences
c. They both have genes that code for the same traits (ex. whether you have freckles
or not)
d. They both are the same size
______ 4) What is the relationship between B and C above?
a. they are sister chromatids
c. they are homologous to each other
b. they are centromeres
d. they are genetically identical
______ 5) The chromatid labeled C has a gene that carries the gene for abnormal hemoglobin, the disease
sickle cell anemia. Which of the other chromatids will also have the gene that codes for
hemoglobin?
a. A
b. B
c. D
d. all of these
______ 6) If the chromatid labeled C has a gene sequence that codes for normal hemoglobin, which of the
following chromatids will USUALLY have the exact same gene sequence?
a. A
b. B
c. D
d. all of these
7. Is the homologous pair of chromosomes above in a dividing or non-dividing cell? Explain
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8. What process would a cell undergo if it needed to make a new cell with identical genetic material?
__________________________________________
9. In the picture above, you are looking at double armed, or duplicated chromosomes (DAC). What process do
you know has occurred in order to form DAC? ____________________________
Use the diagram to the right to answer the following questions.
10. What is a pointing to? ____________________________________
11. What are the ends of this structure called? __________________________
12. Is this diagram a DAC or a SAC? ___________
13. This structure shown here is made of two separate yet equal pieces, b is pointing to
each of them – what are they called? ______________________________
14. Diploid refers to a cell with two complete sets of chromosomes in each cell. What does haploid refer
to? ________________________________________________________________________
15. What kind of cells in a human body would be diploid? Give TWO examples.
________________________________________________________________
16. What kind of cells in a human body would be haploid? _______________________
17. Why is it ESSENTIAL that the cells mentioned in #16 are haploid? Explain. _______________________
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