U6 B5 1HVTTO

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

B5 Asexual reproduction

• Take off your jacket
  
• Put your things on your desk
  

       Book/Laptop
       Notebook

• Bag on the floor
  
• Read pages 190-194

Lessongoals

• You can explain the difference between sexual and asexual reproduction.
• You can explain the differences/similarities in DNA between parent(s) and offspring in both sexual and asexual reproduction.
• You can provide and recognize various examples of how plants and other organisms reproduce asexually.

Homework U6 B5

Asgmt 1-7, 3c

OR challenge

Asgmt 4-9 

Wheel of homework

Go to Lessonup.app and use this code

Reward

Penalty

How many visible sepals can you see on the right flower? (number)

How many visible styles can you see on the right flower? (number)

In the ovary of an apple blossom, there are 8 ovules.
During the blooming period of this plant, 6 pollen grains from apple blossoms, 5 from sunflowers, and 2 from a rose land on the flower's stigma.

How many seeds do you expect to find in the fruit eventually? (number)

In reality, an enormous number of pollen grains end up on the stigma of most flowers.
However, not all ovules always develop into seeds.
What could be a reason for this?

Sexual reproduction

Reproduction in which:

• a male and female sex cell fuse
• Involves fertilization

Examples:

• Reproduction in most animals
  
• Reproduction through flowers
  

Asexual reproduction Reproduction in which no fertilization/sex cells are required. 

A part of the (parent) organism becomes a new organism.

A sperm (male sex cell) and ovum/egg cell (female sex cell) fuse, this becomes the new 'child'

A pollen grain (male sex cell) and an egg cell (female sex cell) fuse, resulting in the formation of a plant embryo (baby plant).

Potatoes are thickened parts of the stem (tuber) of a potato plant. If you plant them, a new plant will grow from them.

In the bulb of, for example, a daffodil, smaller bulbs develop. If you plant these, daffodils also grow from it.

Bacteria reproduce by cell division. No fertilization is needed. 1 bacteria will 'copy' itself and become 2 bacteria.

Ginger is the root of the ginger plant. These roots grow underground and form rhizomes; when these roots separate from each other, two new plants are formed.

Strawberry plants, make stems that move above ground (runners) these will at some point start forming new plants. If these runners are cut, two new plants have formed

Cells of orgnanisms contain DNA.
What organelle stores the DNA? (1 word)

DNA is usually curled up into wormlike things.
What are these 'worms' called?
(1 word, plural)

DNA and reproduction

Sexual reproduction

Half of the DNA of both parents, becomes new DNA of offspring

Asexual reproduction 

DNA of the parent and offspring is the same.

Plant propagation

People propagate       plants:

• Cuttings = cutting a piece of stem from a plant and letting it grow into a new plant.
  
• Tissue cultivation = cutting a bud (growing tip) from a plant, letting it grow in tubes into larger plants, optionally repeating the process.

using asexual reproduction to quickly turn 1 plant into multiple.

What you should do: U6 B5

• Pages  190-198
• Asgmt  1-8, 4c

OR challenge

• Asgmt 5-10

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zs = Working in Silence

• No asking questions
• Silent, don't disturb anyone
  
• Stay at your desk

What you should do: U6 B5

• Pages 190-198
• Asgmt 1-8, 4c

OR challenge

• Asgmt 5-10

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zw = Working with whispering

• Teacher is available for questions
• Only whisper with the student next to you
• Stay at your desk

Tidy Duty

Today these people are on tidy duty

• Desks: empty and straight
• Chairs:  underneath the desks
• Floor: no rubbish