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1/2)(1/2) = 1/4 chance your child will have blue eyes. Out of the 16, there's only one situation where I inherit the recessive trait from both parents for both traits. All of a sudden, my pen doesn't-- brown eyes. I had a small teeth here, but the big teeth dominate. So let's say I have a parent who is AB. Worked example: Punnett squares (video. 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 she could contribute this brown right here and then the big yellow T, so this is one combination, or she could contribute the big brown and then the little yellow t, or she can contribute the blue-eyed allele and the big T. So these are all the different combinations that she could contribute. This is just one example. Big teeth and brown eyes. Very rare but possible.
Let's say you have two traits for color in a flower. So because they're on different chromosomes, there's no linkage between if you inherit this one, whether you inherit big teeth, whether you're going to inherit small brown eyes or blue eyes. Which of the genotypes in #1 would be considered purebred rescue. So this is what blending is. What is the difference between hybrids and clean lines? And these are all the phenotypes. 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.
It doesn't even have to be a situation where one thing is dominating another. Let's say the gene for hair color is on chromosome 1, so let's say hair color, the gene is there and there. So these right there, those are linked traits. Now, if they were on the same chromosomee-- let's say the situation where they are on the same chromosome. Which of the genotypes in #1 would be considered purebred if the following. I met a person, who's parents both had brown eyes, but ther son had dark brown? But let's say that a heterozygous genotype-- so let me write that down. Well, in order to have blue eyes, you have to be homozygous recessive. You could have red flowers or you could have white flowers. G. What you see is what you get. O is recessive, while these guys are codominant.
Well examining your pedigree you'd find out that at least one of your relatives (say your great grandmother) had blue eyes "bb", but when they had a kid with your "BB" brown great-grandfather, the children were heterozygous (one of each allele) and were therefor "Bb". All of my immediate family (Dad, mum, brothers) all have blue eyes. At7:20, why is it that the red and white flowers produce a pink flower? Which of the genotypes in #1 would be considered purebred for a. 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. This will typically result in one trait if you have a functioning allele and a different trait if you don't have a functioning allele. 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. What makes an allele dominant or recessive? So Grandpa and grandma have Brown eyes, and so does your Mom. Hybrids are the result of combining two relatively similar species.
So big teeth, brown-eyed kids. Wasn't the punnett square in fact named after the british geneticist Reginald Punnett, who came up with the approach? It gets a little more complicated as you trace generations, but it's the same idea. What's the probability of a blue-eyed child with little teeth? Well, this is blue eyes and big teeth, blue eyes and big teeth, blue eyes and big teeth, so there's three combinations there. So, the son could have inherited those dark brownm eyes from someone from his parents' relatives. Let me do it like that. In terms of calculating probabilities, you just need to have an understanding of that (refer above). And, of course, dad could contribute the same different combinations because dad has the same genotype. Actually, I want to make them a little closer together because I'm going to run out of space otherwise. How is it that sometimes blonde haired people get darker hair as they get older? I didn't want to write gene. And then the other parent is-- let's say that they are fully an A blood type. So instead of doing two hybrids, let's say the mom-- I'll keep using the blue-eyed, brown-eyed analogy just because we're already reasonably useful to it.
What happens is you have a combination here between codominance and recessive genes. Independent assortment, incomplete dominance, codominance, and multiple alleles. So this is the genotype for both parents. However, sometimes it is the other way around and the defective gene is dominant because it malformed protein will block the action of the correctly formed protein (if you have the recessive allele that works). So there's three potential alleles for blood type. Try drawing one for yourself. For example, you could have the situation-- it's called incomplete dominance. So the mom in either case is either going to contribute this big B brown allele from one of the homologous chromosomes, or on the other homologous, well, they have the same allele so she's going to contribute that one to her child. F. You get what you pay for. So this is a case where if I were look at my chromosomes, let's say this is one homologous pair, maybe we call that homologous pair 1, and let's say I have another homologous pair, and obviously we have 23 of these, but let's say this is homologous pair 2 right here, if the eye color gene is here and here, remember both homologous chromosomes code for the same genes.
Let's see, this is brown eyes and big teeth, brown eyes and big teeth, and let me see, is that all of them? Since your father can only pass a "b", your eye color will be completely determined by whether your mom gives you her "B" or her "b". For many traits, probably most, there are multiple genes involved in producing the trait so there is not a simple dominance/recessiveness relationship. Could my eye colour have been determined by a mix of my grandparents' eyes? They will transfer as a heterozygous gene and may possibly create more pink offspring. Students also viewed. For example, how many of these are going to exhibit brown eyes and big teeth? If you choose eye color, and Brown (B) is dominant to blue (b), start by just writing the phenotype (physical characteristic) of each one of your family members. And now when I'm talking about pink, this, of course, is a phenotype. So if you said what's the probability of having a blue-eyed child, assuming that blue eyes are recessive?
Let's say when you have one R allele and one white allele, that this doesn't result in red. Isn't there supposed to be an equal amount? Possibly but everything is all genetics, so yes you could have been given different genes to make you have hazel color eyes. Something on my pen tablet doesn't work quite right over there. I introduced that tooth trait before.
So the different combinations that might happen, an offspring could get both of these brown alleles from one copy from both parents. Are blonde hair genes dominant or recessive? So what is the probability of your child having blue eyes? Learn how to use Punnett squares to calculate probabilities of different phenotypes. And I looked up what Punnett means, and it turns out, and this might be the biggest takeaway from this video, that when you go to the farmers' market or you go to the produce and you see those little baskets, you see those little baskets that often you'll see maybe strawberries or blueberries sitting in, they have this little grid here, right there. It could be useful for a whole set of different types of crosses between two reproducing organisms. There were 16 different possibilities here, right? 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. There may be multiple alleles involved and both traits can be present.
In this situation, if someone gets-- let's say if this is blue eyes here and this is blond hair, then these are going always travel together. And these Punnett squares aren't just useful. And I'm going to show you what I talk about when we do the Punnett squares. You're not going to have these assort independently.