Dihybrid and Two-Trait Crosses

[@AmoebaSisters]

Card Note: At 4:50, we made a card edit that this example is a "test cross" two-trait cross as to be a true dihybrid cross, both parents should be heterozygotes. However, *the steps to solve two-trait crosses are the same* whether the two-trait cross is is a true dihybrid cross (meaning 2 heterozygote parents). See our handout for a true dihybrid cross with two heterozygous parents: www.amoebasisters.com/handouts.html We appreciate an email we received about this topic- thank you! :D If we redo this older video, we will make a point to specify the differences.

[@squareball7017]

I dont quite understand 5:50 where all letters in the side are in lowercase. Could you please elaborate more on the idea? And if so, are there cases where there are uppercase and lowercase letters in the side? Because in a 2x2 punnett square, the sides' are usually different, for instance an 'S' and 's' combo, so why doesn't it apply in a 4x4 or more?

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what

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:D

[@leawilkinson6792]

so do dihybrid crosses provide support for dependent inheritance?

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When will everyone else realize the old saying? "Explain it to me as if I were a child!" Thank you, Amoeba Sisters!! :)

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I’m in 9th and have to watch this

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I have been watching these videos as a refresher for part of studying for my state exam for teaching science. Thank you guys.

[@AmoebaSisters]

+Misty Smith So glad to be a part of your studying---wishing you a wonderful career as a science educator!

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how’s teaching going

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Lexi Battaglia p

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hi

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The FOIL method you explained for the gametes? Now I'm never ever messing up my dihybrid crosses!! Seriously, you guys are the best!!

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Me

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Is it Ms. Vazquez?

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Thank you!!! I got a 90 on my monohybrid/dihybrid test.... great video :)

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I can't explain how much I love these videos. I struggle with science but it's so much easier to understand with cute videos and handouts.

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how are you Tori?

[@miss.losuss]

its been nine years since this comment

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Thank you! I am beyond grateful. This has helped me a lot. I was confused about dihybrid crossing before watching, and now I feel enlightened. Thanks!

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You're videos are saving my scores in Biology! Hope you still make videos! Can you make a video about the Mendel's Laws of Inheritance? Thank you!

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Thank you, my teacher didnt have time to go over dihybrid crossess, so when it same to my homework, I came to you, and you really helped me =)

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felt this.

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This helped me a lot with my homework. Thank you.

[@michelleroberts6597]

wow, thank you SO much for the video. I'm now confident in making dihybrid punnett squares. I was just bored, and I was thinking about a genetics question while watching tv. every once in a while in my advanced age - lol, I think about these things. anyways, I'd realized that I'd forgotten how to do punnett squares for dihybrid-type problems. thank you once again. you guys are great at making these. I'll have to subscribe now 🌞🌞🌞

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I'm taking an online course biology, right now, we're learning about Punnett Squares and Dihybrids and things like that. This video helped me understand it sooooo much better than the information that I was reading. It never explained exactly what gametes were and to freaking foil the letters. Plus it was using cats as examples and I love cats! This was awesome! :D (ps, my cat lovessss our sink also!)

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when you understand a full concept in an 8 minute video instead of an hour long lecture

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Made a dry topic relatable and engaging so that I actually wanted to follow. Refreshing, relatable, uplifting, and informative--thanks!!

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My teacher uses these videos in class.

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God bless you...The dihybrid cross was messing with my head but now everything is clarified. thank you so much😇🥰

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Thank you for the encouragement!! It helps keep us motivated!

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moo looks very smart. ((i know from having smart cats. one of them can almost use a doorknob. not joking))

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don2killu why Mr. Cringe?

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According to the pet food company Candidae, cats enjoy the cold, hard basin of a sink because it helps them cool off. If it's warm outside or if you have the heater on inside, your pet may see your sink as a nice respite from the heat.

[@carolinemcdougall2543]

Massive thankyou to you, I watched this video last night, the night before my exam. :/ and it came up. Chuffed to pieces, never thought i would be so happy to create a dihybrid punnet square. lol.

[@AmoebaSisters]

Caroline Mcdougall Thank you so much, Caroline! So glad to hear that :D

[@griffingaming3279]

Thank youuu. Now i can finish my Homework. Keep up your videos

[@moniquereed3294]

By definition, a dihybrid cross is between two individuals both heterozygous for two traits and produces the 9:3:3:1 ratio. In this example, one parent is homozygous for both traits. The example here is essentially a backcross, the crossing of a hybrid individual with one of its homozygous parents. But it is still a good example of how to do a two-trait cross.

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Professor Mooington is the best!

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That 'cat loving sink' thing and parents of moo (Mr.&Mrs.mooington) was ridiculous !!! 😂❤😻LOL

[@scholar_lami]

Hi! You video is amazing, however I do have a quick question; how do I know that the ratio for the dihybrid cross is 1:1:1:1? Shouldn't it be 4:4:4:4? Why so?

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