1. Reproductive Strategies
GCE BIOLOGY BY2
Reproductive Strategies

2. Place your vote by clicking the ‘Chicken’ or ‘Egg’ button
Which Came First?
Which came first? 20 19 18 17 OR 16 15 14 13 12
The Chicken?
The Egg? 11 10 9
Place your vote by clicking the ‘Chicken’ or ‘Egg’ button 8 7 6 5 4
Be prepared to justify your choice 3 2 1
Chicken
Egg

3. Simple unicellular organism
Reproduction
What type of reproduction does this animation represent?
Simple unicellular organism
Hint:
Identical offspring to the parent is produced.
Mitosis is involved.
Next: What type of reproduction?

4. What Type of Reproduction?
Drag the corresponding numbers to the appropriate circle to determine if the statement relates to sexual or asexual reproduction:
Involves the production of haploid gametes (n)
(sex cells with one copy of each of the parents’ chromosomes) 1 1 2 2
Only involves mitosis 3 3
Produces offspring showing variation from the parent 4 4
Occurs when unicellular organisms, such as amoeba reproduce
Asexual
Sexual

5. Outline of Mitosis Diploid parental cell (2n) Duplication of a
Chromosome is
Followed by nuclear
division
Diploid daughter cells (2n)
Next: Outline of meiosis

6. Each chromosome duplicates to form two
Outline of Meiosis
Haploid gametes
maternal
chromosome
paternal
chromosome
2 chromatids
centromere
(n)
Meiosis II
Meiosis I
Each chromosome duplicates to form two
Pairs of chromatids
Diploid parent cell (2n)
Next: Comparison of mitosis and meiosis

7. Diploid daughter cells
Comparison of Mitosis and Meiosis
Diploid parental cell 2n
1st meiotic
division
(meiosis I)
First division
2nd meiotic
division
(meiosis I)
Diploid daughter cells 2n n n n n
Haploid gametes

8. The Human Life Cycle This is an example of a diploid life cycle 2n 2n
mitosis 2n
mitosis
meiosis n n
meiosis
zygote 2n
fertilisation
This is an example of a diploid life cycle

9. Human The Human Life Cycle
Drag the labels provided to create the Human life cycle
fertilisation
sex organs
Human
zygote
gametes
adult

10. diploid haploid Plant Reproduction sporophyte spores mitosis mitosis
gametophyte
zygote
male gamete
fertilisation
mitosis
haploid
female gamete

11. Reproduction
Task: Compare the life cycle shown below.

12. Fertilisation Compare fertilisation in a fish and humans Human
A strong possibility that
many of the eggs will not
encounter sperm
A lot of waste with both
sexes producing a large
number of gametes
Fertilisation happens
inside the body
Fish
An intromittent organ
required to transfer sperm
into the female’s body

13. Fish The Life Cycle of a Fish adult juvenile spawning fry eggs
Larval fish

14. The Frog Metamorphosis: Frog
Drag the images provided to create the life cycle of a frog
The Frog

15. The Insect Life Cycle
Many insects change form during their lifetime - this is called
metamorphosis. They do this in one of two ways:
a) Complete metamorphosis
b) Incomplete metamorphosis
Click on the images above for a larger version of the life cycles
Next: The fly life cycle

16. The Butterfly The Insect Life Cycle butterfly (adult) pupa eggs larva
Back
Next
larva

17. (showing rudiment of wings)
The Insect Life Cycle
locust (adult)
The locust
eggs
instars
(showing
first wings)
nymph
(showing rudiment of wings)
Back

18. The Fly The Insect Life Cycle Adult Fly Pupa Eggs 3rd larval stage
1st larval stage
2nd larval stage

19. Metamorphosis
Choose an insect and drag it to the ‘insect’ box below. Decide what type of metamorphosis it has, then complete its life cycle by dragging the appropriate labels into the correct position on the diagram:
incomplete metamorphosis
complete metamorphosis
pupa
adult
insect
egg
larva
chrysalis
metamorphosis
nymph