Punnett Squares and Mendelian Genetics Part 1

This video introduces Mendelian genetics, specifically as it applies to Punnett squares for a monohybrid cross. You’ll Learn basic genetic terminology, including the difference between homozygous dominant, homozygous recessive, and heterozygous genotypes. You’ll also learn my MCAT shortcut to save time and ensure you NEVER have to draw a Punnett square on the MCAT.

In this video:
[0:15] Introduction to Mendelian Genetics
[3:05] Description of Dominant and Recessive Traits
[5:39] Explanation of Zygosity
[7:02] Understanding the Punnett Square
[10:14] Result of Monohybrid Cross

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[TrangTran-pqvh]

Thank you so much! I cannot wait for the second video, I always take so much time doing this type of question on my practice MCAT exam!!! You are a lifesaver

[drbettyschueler]

Thanks for the videos, Leah. I'm doing a refresher on genetics, which I haven't studied in over 25 years, and your videos have been a big help.

[Stupify]

Hey Leah! I am working on my AAMC material and testing at the end of the month. Genetics was a biggest content gap and these videos have helped simplify it so much, thank you!

[hadramcoltzau]

This was brilliant, cant wait to see Part 2, with the online GAMSAT next month I'm really going beast mode on my fundamentals.

[DianaGarcia-hojb]

Thank you for everything that you do Leah! You are really making a difference! :)

[topplayer]

"just think of it has having an erection" I'll will never forget this mnemonic

[drishtykamboj]

Your pneumonic is very nice ...here is one other thing ...pollen are produced on upper part of male reproductive system in plants and egg in basal part of female reproductive system i.e. inside ovary

[chinazaumeh]

Lovely video. I understand how one can apply this multiplication method to find the probability of getting a homozygos trait. However I am having a difficult harnessing this method to find out the probability of heterozygous traits. Can someone help with this please?

[rezhnarasheed]

Leah, I have watched all your videos on this and understand the concepts and how to do these but I am having trouble figuring this problem out that is on the MCAT test:

"In a species of beetle, red body color is dominant to brown. Two red beetles are crossed and produce 31 red and 9 brown offspring (F1 generation). If two red F1 beetles are crossed, what is the probability that both red and brown beetles will appear in the F2 generation? (Note: Assume Mendelian inheritance patterns.)"

Please explain? I am having trouble working backwards with this aamc problem!

[jaypark]

What if an F1 generation were crossed to both P1 generation? what's the result? I'm really having a hard time in this problem😭