Which of Mendel's postulates can only be demonstrated in crosses ...

Question

Which of Mendel's postulates can only be demonstrated in crosses involving at least two pairs of traits? State the postulate.

Accepted Answer

Hi, everyone. Welcome back. Let's look at our next problem. It says according to one of Mendel's laws, all separate during meiosis to form gametes, he termed this the, well, when we talk about the fact that two all for a single gene separate and that, so that the offspring inherit just one allele from each parent. Um We're looking at choice c the law of segregation. So the separation of the two, all that every individual has into gametes so that each individual passes on only one allele for any particular gene. Well, let's look through our other answer choices to understand why they're not correct choice. A says the law of dominance. Well, the law of dominance just says that some alleys are dominant while some are recessive and that the dominant allys mask the expression of the recessive ones. So that's not what we're talking about here since we're just looking for the one that says all separate. So that's not correct. Choice. B says the law of independent assortment and this law refers to the inheritance of genes for different traits. And the law of independent assortment says that genes for different traits segregate into gametes independently. And Mendel um came to that conclusion based on his experiment with the peas, where he found that separate traits like the shape and the color of the peas, um assorted independently. So you could start with a green round pea parent and a yellow wrinkled pea parent. And after crossing them in generations, you could end up with green wrinkled peas or yellow round peas. Now, always we want to note that Mendel got lucky. He chose traits that were on different chromosomes. And of course, now, with our understanding that how genes are passed is their location on chromosomes. When you have genes close together on the same chromosome, they do not assort independently. So law of independent assortment always has sort of an asterisk on it in that um if the genes are on the same chromosome, it isn't that simple. So choice B is not correct because that's not, again, not the phenomenon we're talking about here. We're just talking about the fact that each gammy gets only one alley. And finally, law of inheritance um is choice D and law of inheritance is just the general term for all three of these laws. So referring to the law of dominance, the law of independent assortment or the law of segregation. So that's not our answer since that's too general for what we're looking for. So choice D is not our answer since that's the general term for all three laws. So again, uh Mendel's law that says that all will separate during meiosis to form gametes is the choice c law of segregation. See you in the next video.

Which of Mendel's postulates can only be demonstrated in crosses involving at least two pairs of traits? State the postulate.

Key Concepts

Mendel's Law of Independent Assortment

Dihybrid Cross

Phenotypic Ratio

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