00:01
All right.
00:01
So we have a myosis question.
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Miosis is an important source of genetic variation, sexually reproducing organisms.
00:08
Identify the key events in myosis that result in segregation and independent assortment, how these two mechanisms produce genetic variation.
00:16
So, and use all these terms, alleles, homologous chromosomes, non -hemologous chromosomes, and genes.
00:22
So first, let's define the terms.
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Genes, right? your genes are essentially instructions for how to make.
00:30
Certain proteins and form certain traits, right? genes you can think of as your genetic blueprint.
00:37
Alleles are different versions of those genes, right? so let's say we're looking at a gene for flower color.
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You could have an allele for purple flowers and an allele for white.
00:48
Those are the same genes, right? it's still informing flower color, but alleles, these are the different versions.
00:54
Purple, the purple allele, or white allele.
00:58
If they're homologous chromosomes, homologous means they have the same genes, right? so for every, for most organisms, right, they're going to be diploid, meaning there's two sets of chromosomes, one set for you got from mom, the egg, one from dad, the sperm.
01:15
So, um, homologous chromosomes, these are the chromosomes that have the same genes on them.
01:25
So maybe if we're looking, think about those flowers again, there's one chromosome that has your flower color color and flower shape genes.
01:32
On it, right? whereas non -hemologous chromosomes are chromosomes that are not the same, or that don't have the same genes on them.
01:41
Right? maybe your sex chromosomes versus other autosome, other body chromosomes.
01:48
So now we know what those terms are.
01:50
Let's look at meiosis, right? this, i got this from the internet, so i'm citing it, rice university.
01:57
Thank you.
01:58
But it's this process of making our gametes.
02:01
And we're essentially going through two cell divisions.
02:03
Myosis 1, myosis 2.
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In myosis 1, what's happening is we replicate our chromosomes during prophase, right? interphases we're getting ready to replicate.
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So notice these chromosomes are one single line.
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They turn into x's.
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That's because they're replicated.
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Those chromatids, each copy stay connected together...