Ch. 6 and Intro to Ch. 7 Online
Name__________________pd___
A. Go to Classzone.com. Go to Chapter 6, Animated Biology, Click on “Meiosis”. Watch the Meiosis
simulation and answer the following questions.
1. In prophase I, note the color key (chromosomes from mom and chromosomes from dad). What do
the homologous chromosomes begin to do in this stage?
2. Describe how the chromosomes line up on the Metaphase I plate.
3. Describe how random assortment promotes genetic diversity.
4. What happens to sister chromatids in Anaphase I?
5. After Meiosis I, 2 cells are formed that are (haploid / diploid).
6. What does “haploid” mean? Define “diploid”.
Haploid:
Diploid:
7. Describe how chromosomes align themselves on the equator in Metaphase II?
8. In which stage do sister chromatids separate? ___________________________
9. In this model, there were ________(#) cells at the end with ___________(#) each.
B. Go to Assessment, Section Quizzes, Chapter 6 (in Unit 3: Genetics) Complete the section quizzes
and then answer the following questions pertaining to each section.
6.1
1. A skin cell is haploid. (True/False)
2. The process that produces gametes is (meiosis / mitosis).
3. Autosomes are chromosomes that exist in cells as _______________pairs.
6.2
1. Homologous chromosomes separate in (stage) _________________of Meiosis.
2. Sister chromatids separate in anaphase II. (True/False)
3. Female germ cells form how many egg cells? ___________
6.3
1. Why did Mendel use purebred plants?
2. One of Mendel’s conclusions was: organisms inherit ___ copies of each gene, ___ from each parent.
3. When Mendel crossed a purebred purple flower plant (P generation) with a purebred white flower
plant (P generation), all of the F1 offspring were (white / purple).
6.4
1. A person who has two identical alleles at a specific locus is described as _____________, and a
person with two different alleles at a specific locus is described as _______________.
2. Kk, KK, and kk are examples of a person’s (phenotype / genotype).
3. Tt and TT are both considered what kind of traits?
6.5
1. The letters in a Punnett square represent _______________________________________.
2. Mendel’s law of _________________ _________________ says that allele pairs separate
independently in meiosis.
3. A test-cross involves a heterozygous dominant and a homozygous recessive. (True/False)
6.6
1. What is the exchange of chromosome segments during prophase I of meiosis called?
2. All animals have the same number of chromosomes. (True/False)
3. When two genes are linked then they are (close together / far apart) on a chromosome.
C. This is the crossword puzzle from Chapter 6 Interactive Review. Complete the puzzle below.
Across:
1. model for predicting all
possible genotypes resulting
from a cross
5. exchange of chromosome
segments during meiosis I
7. collection of all of an
organism’s physical
characteristics
9. collection of an organism’s
genetic information that codes
for traits
12. characteristic that is inherited
14. alternative forms of a gene
that occur at one locus on a
chromosome
16. male gamete
18. mating of two organisms
19. study of heredity patterns
and variation of organisms
Down:
1. likelihood that a particular
event will happen
2. process by which gametes are
produced
3. cell that makes up all of the
body tissues and organs
4. type of organism whose
ancestors are genetically uniform
6. fusion of an egg and sperm cell
8. cell that has only one copy of each chromosome
10. female gamete
11. all of an organism’s genetic material
13. sex cell; an egg or a sperm cell
15. cell that has two copies of each chromosome
17. form of nuclear division that divides a diploid cell into haploid cells
D. Go to Chapter 6 Animated Biology Click on “How Genotype Affects
Phenotype”. Follow the directions in the simulation. While completing this exercise, list three traits (the
alleles) you had to change to alter the phenotype of your “baby dragon”.
Traits
Chromosome
1.
2.
3.
E. Go to Animated Biology, Chapter 7, “Human Chromosomes”. Complete the karyotype activity (click
and drag, so you have correct autosomes and sex chromosomes). Then complete the following.
Chromosome
Description
number
1. ______2
a. a gene responsible for polydactyly (extra digits)
2. ______4
b. a gene involved in insulin dependent diabetes mellitus
3. ______6
c. a mutated gene causes hemophilia
4. ______7
d. a gene responsible for green or blue eye color
5. ______9
e. an extra one of these chromosomes leads to Down Syndrome
6. ______12
f. a gene responsible for celiac disease (gluten sensitivity)
7. ______15
g. a gene responsible for red hair color
8. ______18
h. a gene responsible for mild albinism
9. ______19
i. a gene responsible for late-onset Alzheimer’s disease
10. _____21
j. a gene responsible for brown hair color
11. _____X
h. a mutated gene that leads to carpal tunnel syndrome
F. Go back “Home” on Classzone.com, click on “Biozine” at the bottom of the page. Under “Textbook
Articles”, Click on Stem Cell Research-Potential Solutions, Practical Challenges. Answer the following.
1. _____________ cells are undifferentiated cells that can regenerate themselves and develop into
specialized types of cells.
2. Given the context of sentence 1, what does “undifferentiated cells” mean?
3. Several potential benefits of stem cells include but are not limited to:
a. Stem cells could be used to grow human tissues to test the effects of
_______________________.
b. Studying adult stem cells may help scientists better understand how tissues _______________
and what goes wrong when those tissues become ____________________.
c. Stem cells may be used to __________________ tissues. For example:
i. ________________________ kills blood-producing cells in bone marrow.
ii. Many chemotherapy patients have marrow taken before treatment that is later
reinjected into the patient after treatment. However, the marrow could have
____________________.
iii. The use of _______________________________ in place of bone marrow
transplants would remove this danger.
4. There are many technical challenges associated with stem cell use.
a. Stem cells can be taken from many sources including an _________________, a
______________________, a patient’s relative, or an established
_____________________.
b. A disadvantage of a stem cell line is:
c. What are scientists doing to help “prevent rejection of stem cells”?
5. What is the relationship between stem cells and tumors?