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Asexual Reproduction in Protists & Monerans AND Comparing Sexual & Asexual Reproduction. BY: BRIANNA SHIELDS January 31, 2006. DO NOW. 1. A body structure of behavior that makes an organism a better competitor or more fit in their environment is known as…

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asexual reproduction in protists monerans and comparing sexual asexual reproduction

Asexual Reproduction in Protists & Monerans ANDComparing Sexual & Asexual Reproduction

BY: BRIANNA SHIELDS

January 31, 2006

do now
DO NOW
  • 1. A body structure of behavior that makes an organism a better competitor or more fit in their environment is known as…
  • 2. Similar body parts between very different organisms, which suggest a common ancestor are known as…….
  • 3. A change in a species over time is called………
  • HAVE YOUR ESSAY OUT ON YOUR DESK
slide3
GOAL
  • To compare sexual and asexual reproduction in animals, protists and monerans
animals sexual reproduction
Sexual Reproduction in Animals

1. Animals, some plants, fungi, protists

2. 2 parents= male & female

3. Gametes

Male= sperm

Female= egg

Animals: Sexual Reproduction
sexual reproduction process
Sexual Reproduction Process:

Sperm fertilizes egg to form zygote (single cell)

Tough coating forms on egg (blocks other sperm)

Zygote divides repeatedly until it forms an embryo

sexual reproduction process1
Sexual Reproduction Process:

Embryo develops into a fetus (begins to look like parents)

Offspring is born

sexual reproduction diagram
Sexual Reproduction Diagram
  • Create a flow chart with pictures to explain the process of sexual reproduction. Label the sperm, egg, zygote, cell division, embryo & fertilization point
animals sexual reproduction1
Sexual Reproduction in Animals

3. Place of fertilization

External = outside body (fish, amphibians)

Internal= in female’s body (birds, reptiles, mammals)

Animals: Sexual Reproduction
animals sexual reproduction2
Sexual Reproduction in Animals

4. Number of offspring tends to correspond to number of eggs female produces at one time

Animals: Sexual Reproduction
numbers of offspring
Humans- 1

Elephant/horse- 1

Cat- 4/5

Dog- 1/12

Numbers of offspring
animals sexual reproduction3
Sexual Reproduction in Animals

5. Appearance of offspring

a. Two parents

b. Two sets of chromosomes

c. Two sets of genes

d. Genes mix- traits from both parents

Animals: Sexual Reproduction
animals sexual reproduction4
Sexual Reproduction in Animals

6. Number of chromosomes

In human body cells = 46 chromosomes

In human sex cells = 23 chromosomes

Animals: Sexual Reproduction
animals sexual reproduction5
Sexual Reproduction in Animals

7. Egg (23) + sperm (23) = 46 chromosomes

Animals: Sexual Reproduction
animals sexual reproduction6
Sexual Reproduction in Animals

8. Once fertilization is completed, zygote divides by mitosis (asexual reproduction)

Animals: Sexual Reproduction
review sexual reproduction in animals1
Why does only one sperm usually enter the egg cell?

When the first sperm enters the egg cell, a tough wall covering develops around it

Review: Sexual Reproduction in Animals
asexual reproduction methods
Asexual Reproduction

Protists

Monerans

Developing/growing animals, plants and fungi

Asexual Reproduction Methods
asexual reproduction methods1
Binary Fission

1. Bacteria

2. Organism divides in half

3. 2 identical daughter cells produced (half the size of their parent)

4. Daughter grows to parental size- then divides

Asexual Reproduction Methods
asexual reproduction methods2
Budding

1. Small bud grows out of parent cell (with identical DNA)

2. Bud breaks off when large enough

3. 2 cells of different sizes produced

4. Ex: yeast & hydra

Asexual Reproduction Methods
asexual reproduction methods3
Regeneration

1. Living things repair themselves by growing lost body parts from remaining cells

2. Ex: lobsters, starfish, lizards

Asexual Reproduction Methods
comparing asexual sexual reproduction
Comparing Asexual & Sexual Reproduction
  • Create a T-chart to compare the following:
    • How many parents?
    • Are sex cells needed? Which ones?
    • What numbers of chromosomes are involved? (at the beginning and at the end)
    • Are offspring different from or identical to parents and why?
    • What signals the beginning of each process?
comparing reproduction types
ASEXUAL

One parent

No sex cells

46 --> 46

Cells produced are identical to the parent- no gene mixing

Begins by cell division (mitosis)

SEXUAL

Two parents

Sex cells necessary (sperm and egg)

23 + 23 --> 46

Cells produced are different from their parents- due to gene mixing

Begins by fertilization

Comparing Reproduction Types
websites
Websites
  • Animal Reproduction Animations
  • Animal Life Cycles