Download Asexual vs. Sexual Reproduction

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Transcript
1
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.
2
Asexual Reproduction
 Binary Fission
 Bacteria
 Plant cuttings
 Fragmention
 Flat worms
3
Asexual Reproduction
 Examples of organisms that reproduce asexually
 Hydra
 Sea Star
 Strawberry
 Archaebacteria
 Eubacteria
 Euglena
 Paramecium
 Yeast
4
Sexual Reproduction
 Requires two parents that each give ½ of the genetic
information to the offspring
 Offspring share the characteristics of each parent
5
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)
6
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.
7
Sexual Reproduction
 Examples of organisms that reproduce sexually
 Chickens
 Iguanas
 Lobsters
 Sharks
 Humans
 Butterflies
 Sunflowers
 Roses
8
Make a Venn Diagram
Asexual Reproduction
• Produces more
offspring
• Only need one
parent (easier)
• Simpler
• Exact copy of
parent
• NO variation
• Preserves “genetic
continuity”
Sexual Reproduction
Both
Types of
reproduction
in living
organisms
Pass DNA
from parent
to offspring
•
•
•
•
•
Slower
Need to find a mate
More complex
Mix of parents
Allows for high
amounts of
variations
• Better at adapting
to environment
• Mutations! (bad
ones)
9