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fandomhigh2006-02-27 05:32 pm
the-ascended.livejournal.com) wrote in fandomhigh2006-02-27 05:32 pm
Entry tags:
Anthropology, 6th Period
Daniel is looking a bit tired this morning. It doesn't look like he slept well this weekend.
"First thing first, I'm afraid, is a test on the genetics words I set you last lesson."
He pulled down the whiteboard to reveal the list:
Recessive
Alleles
F1 generation
Phenotype
Sex-linked.
Law of segregation
Trait
"Right, with that finished with, we're going to be looking at heredity.
Researchers have identified over 13,000 genetically inherited human traits. More than 5,000 of them are diseases or other abnormalities.
We're going to be looking at eye-color. However, keep it in mind that this is simplified. We're looking at it as a two-gene system, when it's actually a complicated polygenic system. I want you to look this handout
To get a better idea of how it all works, we're going to be using this Eye Color Calculator. Now, as I fill it in: I have blue eyes, and so did both of my parents. Now, um, my, um mate has brown eyes and her parents had brown and green eyes. So, I've filled that in, click calculate, and there we have it. There's a fifty-percent chance of the baby having brown eyes, a 20.8% of blue and a 29.1% chance of green eyes."
Daniel was clearly lost in thought for a moment before snapping out of it. "Okay, try it for yourself, using your parent's, or your own eye-color or what ever you like. You can also change the allele frequency, so see how that affects the percentage."
"Okay, for homework, I'd like for you to look at genetic diseases. There can be:
Autosomal recessive
Autosomal dominant
X-linked recessive
X-linked dominant.
I'd like for you to explain what each of them are, and to also give me an example for each. Thank you and I'll see you next lesson."
"First thing first, I'm afraid, is a test on the genetics words I set you last lesson."
He pulled down the whiteboard to reveal the list:
Recessive
Alleles
F1 generation
Phenotype
Sex-linked.
Law of segregation
Trait
"Right, with that finished with, we're going to be looking at heredity.
Researchers have identified over 13,000 genetically inherited human traits. More than 5,000 of them are diseases or other abnormalities.
We're going to be looking at eye-color. However, keep it in mind that this is simplified. We're looking at it as a two-gene system, when it's actually a complicated polygenic system. I want you to look this handout
To get a better idea of how it all works, we're going to be using this Eye Color Calculator. Now, as I fill it in: I have blue eyes, and so did both of my parents. Now, um, my, um mate has brown eyes and her parents had brown and green eyes. So, I've filled that in, click calculate, and there we have it. There's a fifty-percent chance of the baby having brown eyes, a 20.8% of blue and a 29.1% chance of green eyes."
Daniel was clearly lost in thought for a moment before snapping out of it. "Okay, try it for yourself, using your parent's, or your own eye-color or what ever you like. You can also change the allele frequency, so see how that affects the percentage."
"Okay, for homework, I'd like for you to look at genetic diseases. There can be:
Autosomal recessive
Autosomal dominant
X-linked recessive
X-linked dominant.
I'd like for you to explain what each of them are, and to also give me an example for each. Thank you and I'll see you next lesson."
Re: Genetics vocab test
Recessive — trait of an organism that can be masked by the dominant form of a trait
Allele — alternative forms of a gene for each variation of a trait of an organism
F1 generation - Offspring of a cross between true breeding plants, homozygous for the trait of interest
Phenotype — outward appearance of an organism, regardless of its genes
sex-linked - A gene coded on a sex chromosome, such as the X-chromosome linked genes of flies and man.
Law of segregation — Mendelian principal explaining that because each plant has two different alleles, it can produce two different types of gametes. During fertilization, male and female gametes randomly pair to produce four combinations of allele
Trait — characteristic that is inherited; can be either dominant or recessive