Activity 57: Copycat
Challenge: What is the difference between sexual
and asexual reproduction.
Procedure:
1. READING!! :0)
2. Complete Stop and think 1, 2, 3 and 4 in nbk
3. Complete Analysis Questions 1 and 2 in nbk
Stop and Think Questions:
1. In asexual reproduction of bacteria, is it
clear which one is the parent? Explain.
In asexual reproduction it is NOT
clear which cell is the parent and
which cell is the offspring BECAUSE they
are identical copies.
2. How do you respond to the question
“Only single-celled organisms reproduce
asexually, how could multi-cellular cells
do that?
Not only single-celled organisms
reproduce asexually. Multi-cellular
organisms can reproduce by: runners and
budding.
BACKGROUND info:
Human species have 46 chromosomes (23 prs)
Example:
Humans have 46 chromosomes:
Pairs #1-#22 Body Chromosomes (44)
Pair #23
Sex Chromosomes (2)
*Normal body cells have 46 chromosomes in
the nucleus.
*Sex cells (sperm and egg)
have 23 chromosomes in the nucleus.
EGG + SPERM= NEW CELL
(23) (23) = (46)
Fertilization!! Gives GENETIC VARIATION
Egg gives “x” chromosome for its’ #23
chromosome
Sperm gives “x” OR “y” for its’ #23
Example:
Egg (x) + sperm (x)= XX girl
Egg (x) + sperm (y)= XY boy
Twins:
fraternal
2 eggs fertilized by
2 different sperm
identical
1 fertilized egg
splits
3. Why are identical twins much more
similar than fraternal twins? Explain.
Identical twins are from the same egg and
sperm union.
Fraternal twins are from 2 egg and 2 sperm
unions.
4. How is a clone different from an identical
twin?
Clones are produced
Asexually and identical
twins are produced
sexually.
Nature vs. Nurture
Nature: your genetic makeup (your blueprint)
Nurture:
your environment/how you were raised.
Analysis Questions: 1 and 2
1. a. orange cat x black cat= tortoiseshell cat
sexual reproduction (2 parents)
b. cutting from a geranium plant: 1
parent=asexual
c. red plant x white plant = red plant
2 parents= sexual reproduction
d. male sperm x fish eggs = baby fish
2 parents= sexual reproduction
e. worm splits into 2= 1 parent= asexual repro
f. sheep is cloned= 1 parent= asexual repro
2. Would you clone yourself? Explain.
Sexual Reproduction:
2 parents
Must have sperm and egg
Offspring are GENETICALLY different
tap
pat
apt
Asexual Reproduction vs Sexual Reproduction
1 parent
No sperm/egg
Identical (clone)
2 parents
use sperm/egg
different from parent