Cette leçon contient 12 diapositives, avec diapositives de texte et 2 vidéos.
La durée de la leçon est: 60 min
Éléments de cette leçon
Welcome everyone!
Today:
Explanation of sexual reproduction (page 213)
Making homework
Slide 1 - Diapositive
Flower of the week: Foxglove
Slide 2 - Diapositive
Flower rapeseed
Rapeseed after flowering
Slide 3 - Diapositive
What are we going to study today?
Today we are going to learn:
What sexual reproduction is.
How sex cells are made.
How fertilization can occur in animals.
Slide 4 - Diapositive
Sexual reproduction
Sexual reproduction requires 2 sex cells, one male and one female. Because of the sex cells, there is always a difference between the parent and the child.
Slide 5 - Diapositive
Cell division
Normally, during cell division, all chromosomes (strands of DNA in the cell nucleus) are copied and moved to a new cell.
Slide 6 - Diapositive
Sex cells
The making of sex cells happens in almost the same way. The big difference is that not all chromosomes are copied and transferred, but half only half of them. This is also called meiosis.
Slide 7 - Diapositive
Fertilization
The fusion of the two sex cells is called fertilization. This occurs in different ways. When the egg is fertilized outside the body, this is called external fertilization. This occurs frequently in fish.
Slide 8 - Diapositive
Slide 9 - Vidéo
Fertilization
When fertilization occurs inside a body, it is called internal fertilization. This occurs in many land animals. For this, animals must mate.
Slide 10 - Diapositive
Slide 11 - Vidéo
Homework
The homework for the next lesson are the assignments from paragraph 6.6, including the summary and plus exercise. You need to start with that now.
La durée de la leçon est: 60 min
