Chapter 11 Review sheet: Meiosis and Sexual Reproduction
Part I. Karyotype. Use the information below as well as the karyotype shown to answer
the following questions.
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Down Syndrome is caused by the inheritance of an extra chromosome 21.
Klinefelter’s Syndrome is caused by the inheritance of an extra X chromosome.
Edward’s Syndrome is caused by the inheritance of an extra chromosome 18.
Turner’s syndrome is cause by missing an X chromosome.
1. Based on the karyotype shown below, which of the above syndromes does the
individual have? How could you tell?
2. What is the gender of the individual? How could you tell?
3. If the individual were missing one of the chromosomes in pair #1, would the
organism ever develop in the womb? Why or why not? (2)
Part II. Sexual vs. asexual reproduction. Fill in the chart below comparing sexual and
asexual reproduction.
Sexual reproduction
Number of parents
How offspring
compare to the
parents
Examples
Union between _______
and __________ cells
Asexual reproduction
1. Binary fission in bacteria
2. ___________________ in
worms
Part III. Fill in the blank. Complete each sentence below.
3. There are _______ chromosomes in egg or sperm cells.
4. There are _______ chromosomes in body cells, such as blood, skin, bone, and
hair.
5. Sometimes, chromosomes don’t separate properly during meiosis. If a cell has 3
copies of a chromosome rather than 2, it is known as a _______________.
6. If a cell has 1 copy of a chromosome rather than 2, it is known as a
_______________.
7. ____________ chromosomes determine your gender.
8. If you inherit 2 X chromosomes, you will be a _________.
9. If you inherit an X and a Y chromosome, you will be a _________.
10. The female sex cell is known as a(n) ____________.
11. The male sex cell is known as ______________.
12. The process that fuses the male sex cell with the female sex cell is called
________________________.
13. When a sperm and an egg fuse, the resulting cell is called a _______________.
You all started out life as this!
14. _____________________ chromosomes have the same genes.
15. ____________________ are the 44 chromosomes that have nothing to do with
your gender.
16. __________________ cells is another name for body cells, such as hair, skin,
bone, and blood.
17. __________________ is the process that produces eggs and sperm, which have
half the number of chromosomes of their parent cells.
18. In males, meiosis results in ______ haploid sperm cells.
19. In females, meiosis results in ______ haploid egg cell, and 2-3 ________
__________ that die.
20. The process of making sperm is ___________________________.
21. The process of making eggs is _____________________.
Part IV. Short answer.
22. Name 2 advantages of reproducing asexually.
23. Why would organisms who reproduce sexually have an advantage in terms of
their survival if there were changes to the environment?
Part V. True or false. Read each statement below, and identify whether it is true or
false.
___ 24. You started out life as one cell, which was formed when the sperm cell
fertilized the egg cell.
___ 25. You once looked no different from any other vertebrate at their early stages of
development.
___ 26. You had gills early in development.
___ 27. You had a tail early in development, which eventually became your backbone.