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GCE BIOLOGY BY2Reproductive Strategies

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Which Came First?

Chicken Egg

The Chicken? The Egg?

Place your vote by clicking the ‘Chicken’ or ‘Egg’ button

Be prepared to justify your choice

Which came first?

OR

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Reproduction

What type of reproduction does this animation represent?

Hint:Mitosis is involved.Identical offspring to the parent is produced.

Simple unicellular organism

Next: What type of reproduction?

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Sexual

Occurs when unicellular organisms, such as amoeba reproduce

Produces offspring showing variation from the parent

Only involves mitosis

What Type of Reproduction?

Drag the corresponding numbers to the appropriate circle to determine if the statement relates to sexual or asexual reproduction:

Asexual

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Outline of Mitosis

Diploid parental cell (2n)

Duplication of a Chromosome is

Followed by nucleardivision

Diploid daughter cells (2n)

Next: Outline of meiosis

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Outline of Meiosis

maternalchromosome

paternalchromosome

Diploid parent cell (2n)Each chromosome duplicates to form two

Pairs of chromatids

2 chromatidscentromere

Meiosis IMeiosis II

Haploid gametes

(n) (n) (n)(n)

Next: Comparison of mitosis and meiosis

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Comparison of Mitosis and Meiosis

Diploid parental cell2n

First division

Diploid daughter cells2n

Haploid gametes

n n n n

1st meioticdivision

(meiosis I)

2nd meioticdivision

(meiosis I)

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The Human Life Cycle

2n 2n

meiosis

meiosismitosis

mitosis

2n

zygote 2n

fertilisation

nn

This is an example of a diploid life cycle

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The Human Life CycleDrag the labels provided to create the Human life cycle

Human

fertilisation

sex organs

zygote

gametes

adult

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Plant Reproduction

sporophyte

spores

gametophyte

mitosisfertilisation

zygote

male gamete

female gamete

diploid

haploid

mitosis

mitosis

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Reproduction

Task: Compare the life cycle shown below.

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Fertilisation

Human

Fish

Compare fertilisation in a fish and humans

A strong possibility thatmany of the eggs will not

encounter sperm

A lot of waste with bothsexes producing a large

number of gametes

Fertilisation happensinside the body

An intromittent organ required to transfer sperm

into the female’s body

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The Life Cycle of a Fish

Fish

eggs

spawning

Larval fish

fry

juvenile

adult

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Metamorphosis: FrogDrag the images provided to create the life cycle of a frog

The Frog

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The Insect Life CycleMany insects change form during their lifetime - this is calledmetamorphosis. 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

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The Insect Life Cycle

The Butterfly eggspupa

larva

butterfly (adult)

NextBack

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The Insect Life Cycle

The locust eggs

nymph (showing rudiment of wings)

locust (adult)

instars (showing first wings)

Back

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The Insect Life Cycle

The Fly

Eggs

1st larval stage

2nd larval stage

3rd larval stage

Pupa

Adult Fly

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Metamorphosis

metamorphosis

insect

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:

complete metamorphosis

incomplete metamorphosis

egg

larva

nymph

pupa

chrysalis

adult