Download REVIEW SHEET FOR MEIOSIS

REVIEW SHEET FOR MEIOSIS
NAME ______________________________________
1. Define meiosis: type of cell division that occurs in reproductive organs and
produces haploid sex cells
2. Give 2 locations of meiosis in animals: ___TESTES____________&______OVARIES__________
3. What happens to the chromosome number in meiosis? CUT IN HALF
4. Which process is longer mitosis or meiosis?___MEIOSIS________________
5. In mitosis, what happens to the chromosome number? STAYS THE SAME_____________
6. What does N represent? THE NUMBER OF SETS OF CHROMOSOMES
7. If N = 12, what is the diploid number? 24 CHROMOSOMES = 2N
8. If N = 12, what is the haploid number? 12 CHROMOSOMES = 1 N
9. What is another way to write/say diploid? 2N = “DIPLOID”
10. What is another way to write/say haploid? 1N= “HAPLOID”
11. Name 2 kinds of meiosis. The one in males is called _SPERMATOGENESIS_ and the
one in females is called _OOGENESIS__
12. Each time a males goes through meiosis, _4__ (#) sperm are produced.
13. Each time a female goes through meiosis, _1_ (#) egg(s) and _3 (#) polar bodies are
produced.
14. In fertilization, what 2 cells fuse or combine? _EGG__ & _SPERM_
15. In fertilization, are the cells that combine haploid or diploid?__HAPLOID__
16. What is produced at the end of fertilization? __A DIPLOID ZYGOTE__
17. Is this cell at the end of fertilization haploid or diploid? DIPLOID
18. What will this final cell of fertilization become? THIS IS THE FIRST CELL OF THE
NEW BABY AND WILL DIVIDE VIA MITOSIS TO GROW LARGER
Type of cell
Egg
Diploid or Haploid?
HAPLOID
1N or 2N
1N
Sperm
HAPLOID
1N
Zygote
DIPLOID
2N
Skin cell
DIPLOID
2N
DIPLOID (BECAUSE ITS
PART OF THE BODY,
NOT A SEX CELL!)
DIPLOID
2N
DIPLOID (BECAUSE ITS
PART OF THE BODY,
NOT A SEX CELL!)
2N
Ovary cell
Heart cell
Testes cell *think about
this one!
2N
19. Name of this kind of meiosis below__SPERMATOGENESIS_____
46
92
46
23
46
23
23
23
23 EACH
1N
20. Name of this kind of meiosis below___OOGENESIS_______
46
# of eggs produced?
92
46
23
23
23
EGG CELL
1N or 2N in egg?
46
POLAR BODIES
23
21. Name of process__FERTILIZATION___
46
23
23
1N or 2N? 1N
1N or 2N? 1N
1N or 2N? 2N
Name of cell:
EGG
Name of cell:
SPERM
Name of cell: ZYGOTE
21. Show the results of a crossing over:
22. Crossing over produces a new genetic __VARIATION__
23. Complete the following table:
Type of cell
How many
chromosomes in cell?
Heart cell of a horse
30
Diploid or haploid and
chromosome # in that cell?
DIPLOID
2N or 1N and what
does N equal?
2N
Sperm cell of a horse
15
HAPLOID
1N
Pollen of a rose
44
HAPLOID
1N
Leaf of a rose
88
DIPLOID
2N
Egg of a dog
10
HAPLOID
1N
Sperm of a dog
10
HAPLOID
1N
Blood of a dog
20
DIPLOID
2N
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24. SO IN CONCLUSION, meiosis is a process that _HALVES the chromosome number so
that you can get ready to produce a _GAMETE_. This process is necessary, because
everyone knows that when you produce a _BABY__ each parent contributes _HALF_ of
the genetic information. Since this process is leading up to a zygote (which is a
FERTILIZED EGG) it would have to be occurring inside of the female’s OVARY_ and
inside of the male’s _TESTES_. The chromosome number in these organs is originally
_46_ (#) which is the _DIPLOID_(diploid/haploid?) number. Meiosis reduces the
number of chromosomes to the number _23 (in humans) which is the _HAPLOID_
(diploid/haploid?) number. Once the egg and sperm find each other in the process of
__FERTILIZATION__ they produce a ZYGOTE_ which returns the chromosome
number to _46_ which is the _DIPLOID___(diploid/haploid?) number.
WORD BANK:
BABY
EGG (2)
ZYGOTE
46
FERTILIZATION
FERTILIZED
DIPLOID
SPERM
GAMETE
HAPLOID
46
HALF
DIPLOID
HALVES
23