REPRODUCTION
WHY DO WE
REPRODUCE?
All living things experience a drive
to reproduce. But why?
In pairs, think about why living
things want to reproduce.
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SO, WHY?
• Well, in order to pass on
our genes, then we need
to reproduce.
• If a species doesn’t
reproduce, it will cease to
exist!
TYPES OF
REPRODUCTION
Not all reproduction requires a mate/ partner,
all living species can reproduce on their own in
some form.
There are two types of reproduction.
- Sexual (two organisms)
- Asexual (one organism)
TASK
In pairs, answer the following:
- Why might an animal reproduce
asexually?
- Why might an animal reproduce
sexually?
List the pros and cons of:
- Asexual Reproduction
- Sexual Reproduction
ASEXUAL REPRODUCTION
• Asexual Reproduction is when an
organism reproduces itself simply
by copying itself.
• Mostly occurs in non-animal
species like bacteria or nonflowering plants, but there are
exceptions such as corals and
seahorses.
• Even these animals only do it as a
back-up plan when a partner isn’t
available/.
• Mitosis is a form of asexual
reproduction, too!
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ASEXUAL REPRODUCTION:
ADVANTAGES AND DISADVANTAGES
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SEXUAL REPRODUCTION
• The production of new
organisms by the
combination of genetic
information of two individual
of different sexes.
SEXUAL REPRODUCTION :
ADVANTAGES & DISADVANTAGES
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Presentation title
TASK
1. Complete the quiz on the pros and
cons of asexual and sexual
reproduction.
https://wordwall.net/resource/52857133
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MATING SYSTEMS
Reproductive behaviour is largely affected by
the mating system among the animals.
There are two main categories of mating
systems:
1. Monogamy = Each partner only has one
mating partner. I.e., one male only mates with
one female.
2. Polygamy = Each partner has more than one
mating partner. I.e., one or more males mate
with one or more females.
WHY ONE OR THE
OTHER?
Monogamy- The reason for this is all down to what is
more likely to benefit the offspring's chance of
survival.
If both parents are required for care, then they’re
more likely to be monogamous.
Polygamy - If resources e.g. food and water, are
plentiful, the offspring may not need both the mother
and the father to survive and so polygamy may be
the better option.
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TASK
Look at the four pictures of the animals.
Decide in your pairs which animals are
monogamous and which are polygamous.
Write your answers down and answer the
following questions:
- What is the role of the male in the
relationship?
- What is the role of the female in the
relationship?
- Why might this type of relationship work?
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Presentation title
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WERE YOU
CORRECT?
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Polygamous – Lions, Gorillas
Monogamous – Penguins, Bald Eagles
• Most species of penguins are monogamous, • Male lions will reproduce with many
females. The females will look after
one parent will go out to sea to catch fish for
the offspring, as well as catch most
their child, while the other parent will protect
of the food. Male lions will patrol,
their nest.
mark, and guard territory.
• Eagles will hibernate alone, but they will
• In a group of gorillas, there is a
return to the same mate year after year.
dominant silverback which has its
pick of the females. Often, other
males in the group may not have a
partner because of this.
TYPES OF POLYGAMY
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