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13. Complete the monohybrid cross below the example using the directions for completing the Punnett Square in the reading and the example below. Then, list the genotypic ratio and describe the offspring. Be sure to remember that the capital letter is dominant. Example: A green pea plant (GG) is being crossed with a green pea plant (Gg) yellow is the recessive color. G G GG GG Gg Gg G genotype = 2 GG : 2 Gg : 0 gg g phenotype = 4 green pea plants : 0 yellow pea plants A green pea plant (Gg) is crossed with a yellow pea plant (gg). Complete the Punnett Square using THESE genotypes. Genotype: ___ GG : ____ Gg : ____ gg Phenotype: ____ green plants : ____ yellow plants
they have bin boxes were the gs r .
this is very comfussing
Oh, I can definitely help you with this. Let me just finish up with another student real quick, okay?
ok thx :)
Okay, I am here. :) Please give me just a moment to type this stuff up. :)
So your box looks like this, right? Just a little neater... :) |dw:1363383193534:dw|
Okay. This is called a Punnett square. This will help you find out what genes an organism will have and what it will look like, based on the genes the parent gives it. Punnett squares usually test for one gene (a monohybrid cross), (in this case color) but they can test for more than one at the same time. Does this make sense? If so, I can move on.
Okay, great. :) To figure out a Punnett square, you have to realize that everything is based on probability (yes, math). To get a punnett square filled out, we have to multiply the alleles together to figure out gene probability. But don't worry - it's not too hard once you get the knack of it. :) Here's the first one: |dw:1363383633186:dw| Do you get this?
In that first box, I multiplied G * G to get GG
Perfect! :D You got it! Now do you feel comfortable moving on to the next part?
great! Now we do the probability part. Looking at the cross, we can see that ALL of then contain the dominant allele, "G" That means that there is a 100? chance that the flowers will have the dominant color, and a zero percent chance that they will have the recessive (g) color. We can write the ratio like this: 2:2, since there IS a 50% chance that they could *have* the (g) in their genes, even though they won't use it. Does that make sense? |dw:1363384226703:dw|
phenotype = 4 green pea plants : 0 yellow pea plants
So, do you think you could do part 2 on your own, or would you still like me to help you?
imma try on my own frist then c how i do .
Okay, great. :) Let me know if you get stuck or would like me to double-check anything. :)
Wait a minute... A green pea plant (Gg) is crossed with a yellow pea plant (gg). Complete the Punnett Square using THESE genotypes. your square should look like this: |dw:1363385208090:dw|
oh its crossed lol oh ok
You're going to want to make sure the multiplication is right. Also, you may give your science teacher a heart attack if you put the dominant allele last! The dominant (capital letter) allele ALWAYS goes first. :) |dw:1363385814570:dw| Do you think you could get those now?
Also, if it helps, this is how you do the genes. So, let's the mommy flower is gg, and the daddy flower is Gg. Mommy goes on the side, and Daddy goes on top: |dw:1363386017181:dw| lol it sounds kind of sill to put it that way, but do you get it?
so..it Gg..gg at the bottom
Perfect. :) And now... Genotype: ___ GG : ____ Gg : ____ gg Phenotype: ____ green plants : ____ yellow plants
gg=0 Gg=2 gg=2 phenotyp:=2 yelow plant =2
GG=0 Gg=2 gg=2
For the genotype....Not quite... Oh, never mind, I see you changed it. :) Great job! :D
i did it right?
YAY thx so much:)
Oh, you're welcome! You did an awesome job. :) *gives extra medal*