Genetics According to Mendel. The Father of Genetics, AKA the Pea’s Worst Nightmare, AKA Monk of the Millennia, AKA GENEous , AKA Your Favorite Scientist. Oh, hello there. My name is Gregor Mendel. You’ve probably heard of me…. I mean, I am the father of modern genetics….
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The Father of Genetics, AKA the Pea’s Worst Nightmare, AKA Monk of the Millennia, AKA GENEous, AKA Your Favorite Scientist
Oh, hello there. My name is Gregor Mendel. You’ve probably heard of me…
I mean, I am the father of modern genetics…
…huh? You haven’t?!?
Well, lets start at the beginning.
In 1842, when I had completed all of the formal education my family could afford, I entered the monastery. I was 21, and I needed a way to continue my education.
The monastery paid for me to attend the University of Vienna, where I studied physics, chemistry, zoology, and botany. I also studied a new field called ‘statistics’.
After finishing school, I returned to the monastery and began teaching science at the local high school.
But it was not meant to be… due to a dispute with the examiners the during my oral exam to become a teacher. They would not hear my ideas about heredity, which explains how traits are passed down from one generation to another.
Well, forget them, cause myideas form the basis of modern genetics.
I played with my peas!
Can you explain to your partner why I had to mutilate all those flowers?
Get it?!? Pea generation? Smart, famous, and funny. Too bad for the ladies I’m a monk.
Answer the following:
Which traits are dominant and which traits are recessive?
Explain the reasoning you used to determine the dominance or recessiveness of the traits.
Yes, I can make up words like recessiveness… I’m Gregor Mendel! I do what I want!
The chart above shows the results for many crosses for many traits.
Punnett squares represent the possible outcomes of a cross.
Possible combinations of those gametes… AKA offspring!
True breeding tall plant
Hybrid Tall Plant
True breeding short plant
Hybrid Tall Plant
Now, make a Punnett square showing the F1 and F2 generation for each of the traits in the table.
One thing started to bother me. Well, besides being forever alone as a monk.
I wondered if these traits were inherited together as a unit, or if each trait was inherited individually from each other.
To figure this out, I would need to cross two plants which were true breeding for two traits, and keep track of both traits in F1 and F2 generations. This is called a dihybrid cross.
One possibility was that the traits were inherited as a unit.
The other possibility is that the traits are inherited independently.
This seems like a lot… but us monks have lots of time on our hands. I crossed a RRYY plant with a rryy plant.
R: round seed, r: wrinkled seed
Y: yellow seed, y: green seed
Don’t get too tangled up in how to draw a dihybrid Punnett square… at least not yet.
In a certain breed of rabbits, black fur (B) is dominant to white fur (b). If a homozygous black male is crossed with a heterozygous female, what are the possible phenotypes and genotypes of their offspring?
Black fur (B) is dominant, so it will ‘mask’ the white fur (b) trait.
Heterozygous = two different genes (Bb)
Homozygous black = two black fur (B) genes
Phenotype = physical appearance
Genotype = genes
100 % Black fur
50% BB, 50% Bb
So, I hoped you enjoyed learning about white fur (bme, after all, it’s my favorite subject.
Now, complete the next problem on the worksheet that Ms. Leffel gave you.
Remember to respect teachers; after all, even I couldn’t handle the job!