Maybe another offspring gets this one, this chromosome for eye color, and then this chromosome for teeth color and gets the other version of the allele. And I could have done this without dihybrids. The general relationship of price to quality shown in the "Buying Guide and Reviews" can best be expressed by which of the following statements? So this is what blending is. When the mom has this, she has two chromosomes, homologous chromosomes. Which of the genotypes in #1 would be considered purebred if the number. And now we're looking at the genotype. Punnett squares are very basic, simple ways to express genetics. And let's say we have another trait. If you have them together, then your blood type is AB. You can have a blood type A, you could have a blood type B, or you could have a blood type O.
So if I said if these these two plants were to reproduce, and the traits for red and white petals, I guess we could say, are incomplete dominant, or incompletely dominant, or they blend, and if I were to say what's the probability of having a pink plant? So this is also going to be an A blood type. It gets a little more complicated as you trace generations, but it's the same idea. Which of the genotypes in #1 would be considered purebred if given. What makes an allele dominant or recessive?
This one definitely is, because it's AA. We care about the specific alleles that that child inherits. So hopefully, you've enjoyed that. Let's say your father has blue eyes. But let's also assume YOUR eyes are blue. Well, you have this one right here and you have that one right there, and so two of the four equally likely combinations are homozygous dominant, so you have a 50% shot. Let me draw a grid here and draw a grid right there. Worked example: Punnett squares (video. And we can do these Punnett squares. You have to have two lowercase b's. 1/2)(1/2) = 1/4 chance your child will have blue eyes. You = 50% chance of (Bb), or 50% chance that you are (BB). You could get the A from your dad and you could get the B from your mom, in which case you have an AB blood type. Learn how to use Punnett squares to calculate probabilities of different phenotypes. EXAMPLE: You don't know genotype, but your father had brown eyes, and no history of blue eyes (you can assume BB).
So, the son could have inherited those dark brownm eyes from someone from his parents' relatives. So let's say I have a parent who is AB. One, but certainly not the only, reason for dominance or recessiveness is because one of the alleles doesn't work -- that is, it has had a mutation that prevents it from making the protein the other allele can make (it may be so broken it doesn't do anything at all or it may produced a malformed protein that doesn't do what it is supposed to do). This is brown eyes and little teeth right there. In the last video, I drew this grid in order to understand better the different combinations of alleles I could get from my mom or my dad. Which of the genotypes in #1 would be considered purebred if male. Parents have DNA similar to their parents or siblings, but their body design is not exactly as their parents or kin.. Now, how many do we have of big teeth?
And I'm going to show you what I talk about when we do the Punnett squares. You say, well, how do you have an O blood type? And so I guess that's where the inspiration comes for calling these Punnett squares, that these are kind of these little green baskets that you can throw different combinations of genotypes in. So how many are there? It's strange why-- 16 combinations. It can be in this case where you're doing two traits that show dominance, but they assort independently because they're on different chromosomes. A big-toothed, brown-eyed person. Wasn't the punnett square in fact named after the british geneticist Reginald Punnett, who came up with the approach? So after meiosis occurs to produce the gametes, the offspring might get this chromosome or a copy of that chromosome for eye color and might get a copy of this chromosome for teeth size or tooth size. Since both of the "parent" flowers are hybrids, why aren't they pink, like their offspring, instead of red and white.
These particular combinations are genotypes. So if this was complete dominance, if red was dominant to white, then you'd say, OK, all of these guys are going to be red and only this guy right here is going to be white, so you have a one in four probability to being white. OK, so there's 16 different combinations, and let's write them all out, and I'll just stay in one maybe neutral color so I don't have to keep switching. The dad could contribute this one, that big brown-eyed-- the capital B allele for brown eyes or the lowercase b for blue eyes, either one. Your mother has brown eyes, but your grandmother(mom's mom) had blue eyes. Both parents are dihybrid. This is just one example.
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