Transcript Asexual vs. Sexual Reproduction

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Important Background Information
 DNA is a chemical that contains information for an
organisms growth and functions. DNA is made of two
strands of molecules that resembles a twisted ladder or
double helix.
 https://www.youtube.com/watch?v=8kK2zwjRV0M
 Chromosomes are basically compacted DNA, humans
have 46 chromosomes or 23 pairs.
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Haploid vs Diploid Cells
Diploid
Haploid
About
Diploid cells contain two
complete sets (2n) of
chromosomes.
Haploid cells have half the
number of chromosomes (n)
as diploid - i.e. a haploid cell
contains only one complete
set of chromosomes.
Cell Growth and Division
Diploid cells reproduce by
mitosis making daughter
cells that are exact replicas.
Haploid cells are a result of
the process of meiosis, a type
of cell division in which
diploid cells divide to give
rise to haploid germ cells. A
haploid cell will merge with
another haploid cell at
fertilization.
Examples
Skin, blood, muscle cells
Cells used in sexual
(also known as somatic cells) reproduction, sperm and ova
(also known as Gametes).
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Haploid Vs Diploid
 https://www.youtube.com/watch?v=1yu1Zuy_uEQ
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Make a Venn Diagram
Asexual Reproduction
Sexual Reproduction
Both
Types of
reproduction
in living
organisms
Pass DNA
from parent
to offspring
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Asexual Reproduction
 Requires only one parent
 Offspring have 100% the same chromosomes as the
parent.
 In other words, the offspring are exact “clones” of the
parent.
 Most unicellular organisms
reproduce this way.
 Mitosis
 Movie
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Asexual Reproduction
 Binary Fission
 Bacteria
 Protists
Binary fission is a form of asexual
reproduction where every organelle
is copied and the organism divides
in two.
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Asexual Reproduction
 Budding
 Hydra

Movie
Budding is a means of
asexual reproduction
whereby a new individual
develops from an
outgrowth of a parent,
splits off, and lives
independently.
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Asexual Reproduction
 Fragmentation
Fragmentation is a means of asexual
reproduction whereby a single parent
breaks into parts that regenerate into
whole new individuals.
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Asexual Reproduction
 Regeneration
Regeneration occurs
when a body part has
broken off and the
organism grows a
new one.
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Asexual Reproduction
 Examples of organisms that reproduce asexually
 Sea Star
 Strawberry
 Archaebacteria
 Eubacteria
 Euglena
 Paramecium
 Yeast
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Sexual Reproduction
 Requires two parents that each share ½ of the genetic
information.
 Offspring share the characteristics of each parent.
 Meiosis
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Sexual Reproduction
 All the members of the Animal
Kingdom
 Fish
 Mammals
 Amphibians
 Birds
 Reptiles
 Insects
 Crustaceans
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Sexual Reproduction
 Plant Kingdom
 Flowers are the reproductive organs of plants.
Male flower
Female flower
 Some flowers have both male and female reproductive
organs on the same flower.
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Sexual Reproduction
 Examples of organisms that reproduce sexually
 Chickens
 Iguanas
 Lobsters
 Sharks
 Humans
 Butterflies
 Sunflowers
 Roses
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Sexual Reproduction
 Happens 2 ways
 Internally (inside)

The egg is fertilized by sperm inside the female
 Mammals, birds, reptiles, insects, spiders
 Externally (outside)


The egg is fertilized by sperm outside the female
The female lays the eggs and then the male fertilizes
them.
 Fish and some amphibians
 Plants and fungi (pollen and spores)
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Summarize
 Write two paragraphs with 6 sentences each
describing asexual and sexual reproduction.
 Paragraph 1: Asexual reproduction is…..
 Paragraph 2: Sexual reproduction is…
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