U7 L3 Sexual & Asexual Reproduction

Unit 7 Lesson 3 Sexual and Asexual Reproduction
Copyright © Houghton Mifflin Harcourt Publishing Company

Indiana Standards
• 8.3.1 Explain that reproduction is essential for the
continuation of every species and is the
mechanism by which all organisms transmit
genetic information.
• 8.3.2 Compare and contrast the transmission of
genetic information in sexual and asexual
reproduction.
• 8.3.3 Explain that genetic information is
transmitted from parents to offspring mostly by
chromosomes.

One Becomes Two
What is asexual reproduction?
• Reproduction involves various kinds of cell
division.
• Most single-celled organisms and some
multicellular organisms reproduce asexually.
• In asexual reproduction, one organism
produces one or more new organisms that are
identical to itself.

What is asexual reproduction?
• The organism that produces the new organism or
organisms is called a parent.
• Each new organism is called an offspring.
• The offspring produced by asexual reproduction
are genetically identical to their parents.

How do organisms reproduce
asexually?
• Organisms reproduce asexually in many ways.
• Prokaryotes, including bacteria, reproduce
asexually by cell division.
• Some eukaryotes, including many multicellular
organisms, reproduce asexually by more complex
processes—types of cell division called mitosis.

asexually?
• Binary fission is the form of asexual reproduction
in prokaryotes.
• Budding occurs when a bud grows on a full-sized
organism.
• Budding is the result of mitosis.

asexually?
• A spore is a specialized cell that can survive harsh
conditions.
• Spores are light and can be carried by the wind.
• Some plants can reproduce asexually by
vegetative reproduction
• Vegetative reproduction happens through mitosis.

Two Make One
What is sexual reproduction?
• Most multicellular organisms can reproduce
sexually.
• In sexual reproduction, two parents each
contribute a sex cell to the new organism.
• Half the genes in the offspring come from each
parent.

• Males produce sex cells called sperm cells.
• Females produce sex cells called eggs.
• Sex cells are produced by meiosis.

• Sex cells have half of the set of genetic material
found in body cells.
• A sperm and an egg join together in a process
called fertilization.

• When an egg is fertilized by a sperm cell, a new
cell, called a zygote, is formed. It has a full set of
genetic material.
• The zygote develops into a new organism. It
grows through mitosis.

Odd Reproduction
• Multicellular organisms can reproduce asexually.
• Some do this by parthenogenesis, in which the
female produces young without fertilization.
• Other organisms reproduce asexually by
regeneration.
• Other organisms reproduce asexually by
fragmentation, in which segments fall off and
become new organisms.

Added Advantage
What are the advantages of each type
of reproduction?
• Asexual reproduction has its advantages.
• It allows an organism to reproduce very quickly,
and ensures that any favorable traits the parent
has are passed on to the offspring.
• Reproduction can occur without a partner, and all
offspring can reproduce.

What are the advantages of each type
of reproduction?
• Sexual reproduction has its advantages.
• It increases genetic variation. Offspring have
different traits, which improves the chance that at
least some will survive.
• Some organisms can use both types of
reproduction. This allows them to spread quickly,
and adapt to changes in the environment as well.

U7 L3 Sexual & Asexual Reproduction

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Viewers also liked

Viewers also liked (6)

Similar to U7 L3 Sexual & Asexual Reproduction

Similar to U7 L3 Sexual & Asexual Reproduction (20)

More from Lori Stroud

More from Lori Stroud (20)

Recently uploaded

Recently uploaded (20)

U7 L3 Sexual & Asexual Reproduction