Where did I Where did I come from?come from?Asexual vs. Sexual Asexual vs. Sexual

ReproductionReproduction

What do we already know?What do we already know?

By now, you should be By now, you should be very familiar with very familiar with mitosis!mitosis!

Do you remember Do you remember what happens?what happens?

What do we already know?What do we already know?

WHY does mitosis occur?

• In multicellular organisms:

• In unicellular organisms:

For growth and development (cell division!)

For reproduction!

Ah HA!Ah HA!

Mitosis = Asexual Reproduction

YOU, a multicellular organism, are constantly

reproducing…….. asexually!

Asexual ReproductionAsexual Reproduction(Mitosis)(Mitosis)

How many offspring (daughter cells) are there in mitosismitosis?

How many parents (parent cells) are there?

Ummm…Is this like…uh…that stuff we giggle about in health class?

Sexual ReproductionSexual Reproduction(Meiosis)(Meiosis)

How many offspring (daughter cells) are there in meiosis?

How many parents (parent cells) are there?

Where did I come from?Where did I come from?

Meiosis = Sexual

Reproduction

Remember that both egg and sperm go through meiosis to

be created

This is where you came This is where you came from!from!

HalfHalf the genetic information comes from the genetic information comes from each parent (sperm and egg).each parent (sperm and egg).

Meiosis = Sexual Reproduction

This is where you came This is where you came from!from!

Meiosis = Sexual Reproduction

Why you and sis look different!Why you and sis look different!

Meiosis = Sexual Reproduction

Meiosis Problems: nondisjunctionMeiosis Problems: nondisjunction

Meiosis = Sexual Reproduction

Sex!!! Sex!!! (RATED G: none of you have to close your eyes)(RATED G: none of you have to close your eyes)

How many cells are there in the end?

How many cells are there in the beginning?

So let’s compare…So let’s compare…

ASEXUAL REPRODUCTIO

N

SEXUAL REPRODUCTIO

N

One parent cell Two parent cells

Two offspring identical to the

parent cell

One offspring inherits traits

from both parents

Asexual or Sexual Asexual or Sexual Reproduction?Reproduction?

An orange cat is bred with a black cat in An orange cat is bred with a black cat in hopes of producing a tortoiseshell cat.hopes of producing a tortoiseshell cat.

Sexual Sexual Reproduction:Reproduction: There are two There are two parents and the parents and the offspring has offspring has inherited its coat inherited its coat color from both color from both parents. The parents. The offspring is not offspring is not identical to either identical to either parent.parent.

Asexual or Sexual Asexual or Sexual Reproduction?Reproduction?

A cutting is taken from a red-flowered geranium A cutting is taken from a red-flowered geranium and placed in water to develop roots. Once and placed in water to develop roots. Once roots have grown, the new plant is placed in roots have grown, the new plant is placed in soil and grows to produce another red-flowered soil and grows to produce another red-flowered geranium.geranium.

Asexual Asexual Reproduction:Reproduction: The The offspring is offspring is reproduced directly reproduced directly from a single parent from a single parent so it will be so it will be genetically identical.genetically identical.

Asexual or Sexual Asexual or Sexual Reproduction?Reproduction?

A red-flowered geranium with dull leaves is A red-flowered geranium with dull leaves is bred with a white-flowered geranium with bred with a white-flowered geranium with shiny leaves, with a goal of producing a shiny leaves, with a goal of producing a red-flowered geranium with shiny leaves.red-flowered geranium with shiny leaves.

Sexual Sexual Reproduction:Reproduction: Two Two parents produce parents produce offspring with some offspring with some traits from each traits from each parent.parent.

Asexual or Sexual Asexual or Sexual Reproduction?Reproduction?

A male fish releases sperm cells into the A male fish releases sperm cells into the water. One of the sperm unites with an water. One of the sperm unites with an egg from a female fish to form a new cell egg from a female fish to form a new cell that grows into a new fish.that grows into a new fish.

Sexual Sexual Reproduction:Reproduction: Two Two parents reproduce parents reproduce an offspring with an offspring with some traits from some traits from each parent.each parent.

Asexual or Sexual Asexual or Sexual Reproduction?Reproduction?

A small worm that lives in water splits in A small worm that lives in water splits in two and each half grows to normal size. two and each half grows to normal size. The head end grows a tail, and the tail The head end grows a tail, and the tail end grows a head.end grows a head.

Asexual Asexual Reproduction:Reproduction: The The offspring is offspring is reproduced directly reproduced directly from a single parent from a single parent and will be identical and will be identical to it.to it.

Asexual or Sexual Asexual or Sexual Reproduction?Reproduction?

Sheep reproduce only by sexual Sheep reproduce only by sexual reproduction in nature. Using modern reproduction in nature. Using modern technology, a clone of an adult sheep is technology, a clone of an adult sheep is produced.produced. Cloning is Asexual Cloning is Asexual

Reproduction:Reproduction: Genes Genes from only one parent from only one parent are involved. are involved. Technology must be Technology must be involved to enable involved to enable this organism to this organism to reproduce asexually.reproduce asexually.

What would you do?What would you do?

If you were If you were given an given an

opportunity opportunity to clone to clone yourself, yourself,

would you do would you do it?it?