1. REPRODUCTION
Andrea Monclús
Ylenia Blanco
Tatiana Meyer
Iúlia Kochi
2n ESO B

2. WHY DO WE NEED SEXUAL
REPRODUCTION?
I

3. Advantages
-Produces genetic diversity
(more variety in a species)
-One disease may not kill all individuals
-Species can change to survive in
different environments
I

4. POLLINATION (IN PLANTS)
 Sexual Reproduction
 Only occurs inside the
flowers of plants
 Pollen (male cells) are transferred to pistil
(female parts) of a different flower
 Plants don’t move: pollen is transferred by
wind, insects and animals
Y

5. EXTERNAL FERTILIZATION
(IN MANY AQUATIC ANIMALS)
 Sexual Reproduction
 Occurs inside the water
 Eggs (female cells) are released into
the water and sperm (male cells)
are released near the eggs
 Males and females don´t need to
touch each other
A

6. INTERNAL FERTILIZATION
 Sexual Reproduction
 Occurs in most animals
 Male animals have a special
structure to insert their sperm into
the female
 An egg (female cell) combines with
sperm (male cell)
I

7. WHAT ARE SOME ADVANTAGES OF
ASEXUAL REPRODUCTION?

8. Advantages
-Simple process that can be very quick
-Produces many organisms with very little effort
-Produces exact copies of organisms which
may be perfect for the needed environment (like
replacing lost skin cells)
Y

9. BINARY FISSION (IN PROKARYOTES)
 Asexual Reproduction
 Occurs in prokaryotes (simple cells)
like bacteria
 A cell copies its contents then
divides in half
 Fast and easy
 All cells are identical copies
A

10. MITOSIS(IN EUKARYOTES)
 Asexual Reproduction
 Occurs in eukaryotes (cells inside
plants and animals)
 A cell copies its contents (including
the nucleus) then divides in half
 Fast and easy
 All cells are identical copies
 Helps replace dying and old cells
inside organisms
I

11. ROOTS OR STEMS (IN PLANTS)
 Asexual Reproduction
 Plants send out roots or stems to
grow up into new individuals
 All new individuals are identical
copies
Y

12. Sexual or asexual reproduction?
asexual
T

13. REPRODUCTION
COMPARISONS
Sexual Reproduction Asexual Reproduction
Fertilization occurs
(combining a male and
female sex cell)
No fertilization occurs
Needs two parents Only needs one parent
Occurs in almost all animals
and in many plants
Occurs in simple animals
and many plants
Offspring are genetically
different (diverse) from
parents
Offspring are identical
copies (clones) of the parent
T

14. REPRODUCTION VOCABULARY
Asexual Reproduction
Clone
Sexual Reproduction
Genes
Eukaryote
Mitosis
Prokaryote
Binary Fission
Budding
Regeneration
T

15. Hope you like it !!!