How did geneticists determine that inheritance of some phenotypic...

Question

How did geneticists determine that inheritance of some phenotypic characteristics involves the interactions of two or more gene pairs? How were they able to determine how many gene pairs were involved?

Accepted Answer

Hi everyone Welcome back let's look at our next problem. It says when one genes expression is altered by the expression of one or more other genes. This is known as blank. Well the situation where we have one gene for some sort of trait whose expression is affected by a completely different gene on a different locus is known as choice C. Episode Asus. So in episode Asus we have an interaction of two genes and two different lo sai to affect the expression of one trait. So the phenotype controlled by one gene can be master altered by the expression of the second gene. And an example. This isn't laboratory retrievers which a gene for black or brown coat color but whether that gene is expressed is determined by a second gene. So let's look at our other answer choices to understand why they're not correct. So first we have choice a plea a trophy and play a trophy is almost kind of an opposite notion, trophies win. A single gene controls multiple phenotype. So instead of multiple genes interacting to control the expression of one phenotype, you have one gene controlling multiple phenotype sis. Um So that's not the answer. We're looking for. An example of a trophy occurs in humans um where a single gene controls height, weight and growth and humans. Our next choice is choice B. Gene linkage and gene linkage is simply that physical linkage of all the genes located on the same chromosome. So it's not the answer we're looking for. Since these genes can be for different things and not interact at all. Um It just expresses that physical reality that you have a single chromosome. And so all the genes that are on it without recombination would be passed together to an offspring. So as opposed to you know, you have Mendel's laws of independent assortment genes that are linked on one chromosome do not independently assort without recombination. And finally we have choice D dominance and dominance does involve interference with the expression of a gene but at the level of alleles of a single gene. So dominance, When dominance you have one interfering with the expression of another, the dominant allele will interfere with the expression of the recessive allele of the same gene. But not what we're looking for. Since we're not talking about two different genes influencing the expression of a trait. So again when one genes expression is altered by the expression of one or more other genes, this is known as choice C. Episode. Asus hope to see you in the next video

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How did geneticists determine that inheritance of some phenotypic characteristics involves the interactions of two or more gene pairs? How were they able to determine how many gene pairs were involved?