Remus and Romulus
Storyboard Text
- Cell malfunctionCall 001-234-5679
- PLEASE MAKE SURE TO COPY ALL YOUR DNA
- So because there are 46 chromosomes, your cells will need to copy those chromosomes before they can move onto mitosis.
- MITOSIS THAT WAY
- !WANTED!CHROMOSOME WENT MISSINGREWARD - 444K
- I'm Jade!
- SISTER CHROMATIDS
- And I'm Jude
- Chromosomes have sister chromatids. Remember when we said chromosomes are shaped like an “X?” An “X” has two lines and think of those two lines as the sister chromatids.
- X
- MEET JADE AND JUDE: THE CHROMOSOMES
- CENTROMERE
- And there is a structure in the middle of the chromosomes called a centromere. Centromere is in the middle because “centro- = center,” easy to remember, right? And this centromeres hold the sister chromatids together.
- Thanks to our centromere, we're stuck together now!
- If we say all DNA needs to be copied before mitosis, it means that the chromosomes need to be copied.
- Chromosomes have two sister chromatids.
- 42 Chromatids 42 Chromosomes
- 96 Chromatids 42 Chromosomes
- Remember that the number of chromosomes IS the number of centromere. Look at the next square!
- MITOSIS
- ANAPHASE
- METAPHASE
- PROPHASE
- 1 Chromatid1 Chromosome (Haploid)
- So when the DNA IS copied, your homologous chromosomes will now have 2 chromatids, called a diploid chromosome, but because they still only have 1 centromere, you will have just 46 chromosomes with 92 chromatids.
- Before your DNA is copied, there will be only one chromatid, called a haploid chromosome, and if there is a centromere attached to it, you will still call that a chromosome because you are counting the number of centromeres it has. A normal human being has 46 chromosomes. No more. No less.
- 2 Chromatids 1 Chromosome (Diploid)
- This is how it looks like before and after your DNA is replicated. Make sense now?
- Before
- After
- We will remember Prophase as the first step for “pro-” meaning the beginning of mitosis.
- TELOPHASE
- Let's now start with the first step of mitosis! A phase called Prophase.
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