CELL CYCLE AND DEVELOPMENT. Part II: MEIOSIS

As we have seen, the cells reproduce asexually, making copies of themselves through the process called MITOSIS. With this process, from each individual cell we get two identical cells, with the same number of chromosomes (equal to the mother cell).

But there is a special type of cells that are created through a special type of process called MEIOSIS. These cells are the gametes: egg cells and sperm cells. The main differences between mitosis and meiosis are that, first, in mitosis you end up with 2 daughter cells, in meiosis you get 4. And in second place, in mitosis the cells have the same amount of chromosomes as the mother cell, but in meiosis they have half the number of chromosomes.

Como hemos visto, las celulas se reproducen asexualmente, haciendo copias de si mismas por un proceso llamado MITOSIS. Con este proceso, de cada celula individual obtenemos dos celulas hija identicas, con el mismo numero de cromosomas (e igual que el de la celula madre).

Pero hay un tipo especial de celulas que son creadas por un tipo especial de proceso llamado MEIOSIS. Estas celulas son los gametos: ovulos y espermatozoides. Las principales diferencias entre mitosis y meiosis son que, en primer lugar, en la mitosis acabamos con 2 celulas hijas, y en meiosis obtenemos 4. Y en segundo lugar, en la mitosis las celulas hijas tienen la misma cantidad de cromosomas que la celula madre, pero en la meiosis tienen la mitad del numero de cromosomas.

The gametes produced by meiosis come from a pre-existing cell that undergoes two division cycles. As the final cells have half the amount of chromosomes, they are said to be haploid cells (instead of diploid cells).

Los gametos producidos por meiosis proceden de una célula pre-exitente que sufre dos ciclos de división. Al final las células tienen la mitad del número de cromosomas, se dice que son células haploides (en vez de diploides).

Some exercises to practice in English:

Meiosis coloring

Phases Meiosis

Meiosis crossword

Comparing Mitosis vs Meiosis


Algunos ejercicios en español:

Fases Meio

Comparando Mitosis/Meiosis

Unit 6- CELL CYCLE AND DEVELOPMENT. Part I - Cell cyle and Mitosis

During this unit we are going to cover the cell cycle. As you remember the cell is the unit of life, so it is a living organism that is born, grows, develops, eventually reproduces and at a certain moment, dies. 

Durante esta unidad vamos a cubrir el ciclo celular. Como recordareis, la célula es la unidad de vida, así que es un ser vivo que nace, crece, se desarrolla, se reproduce y en cierto momento, muere.

The cells in our bodies reproduce for two reasons: for our own growth and to repair tissues. These are the reasons why the cells reproduce asexually, making copies of themselves, undergoing mitosis.

Las células en nuestros cuerpo se reproducen por dos razones: para nuestro propio crecimiento y para reparar tejidos. Estas son las razones por las que las células se reproducen asexualmente, haciendo copias de si mismas, entrando en la mitosis.

In the human body there are specific cells which are created by a specific process called meiosis: the gametes. At the end of this process from each pre-gametic cell we get four cells with half the number of chromosomes (compared with the rest of the cells in our bodies).

En el cuerpo humano hay células especificas que son creadas por un proceso especifico llamado meiosis: los gametos. Al final de este proceso desde cada célula pre-gametica obtenemos cuatro células con la mitad de cromosomas (comparadas con el resto de células de nuestro cuerpo).

You can find the GOALS for this unit here: http://1drv.ms/1XYIskK

Summary in English: Cell cycle

Resumen en Español: Ciclo celular

EXERCISES

The first exercise we are going to cover is a reading exercise about the Cell Cycle:http://1drv.ms/1Qo9Lmz

La versión en español la podéis encontrar aquí: http://1drv.ms/20FDJ9W

Let's practice some exercises about the MITOSIS phases!

- A basic exercise with different parts and images: http://1drv.ms/1MSXfvJ

- La versión en español: http://1drv.ms/1MSXwyP

- Another exercise with pictures of all the phases, and then a matching exercise:http://1drv.ms/1MSXIxQ

This is the foldable that has all the cell cycle phases: outside we have all the steps of interphase and mitosis, inside we have the whole cell cycle .We can complete it writing in each label a brief explanation of the picture.

One of my students, Jerry Guillen, has created this video with play-doh:

And here I show you the best video I´ve found in youtube: