Consider the following pedigree.

Predict the mode of inheritance...

Question

Consider the following pedigree. Predict the mode of inheritance of the trait of interest and the most probable genotype of each individual. Assume that the alleles A and a control the expression.

Accepted Answer

Hi everyone. Welcome back. Let's look at our next question in the following pedigree identify the mode of inheritance of a particular trait and we have a three generation pedigree here. Let's recall that the shaded in shapes are the affected individuals with square meaning male and circle meaning female. And our answer choices offer us a choice between recessive or dominant trait and autism versus X linked. Well we can tell right away looking at our first generation here that we're not looking at an excellent trait. We have an affected male parent and an affected male offspring. Since males do not pass X chromosomes onto their male offspring. Uh It cannot be excellent. So we can go ahead and eliminate uh choices C. And D. Which are excellent. It's got to be there A. Or B. It must be an autism. All form of inheritance. Now we just have to decide whether it's recessive or dominant. When we look at our pedigree, all the all the affected individuals we see have at least one affected parent. We don't see any skipping of generations. Recessive traits can skip generations since you can have parents who are carriers. If the child inherits a recessive gene from each parent, you can have two unaffected parents since they're carriers but don't aren't affected by the condition and you can have a child that's affected. But in this case we see no skipping of generations. Every affected individual has at least one affected parent. So that shows a pattern of dominant inheritance. So we're gonna go ahead and eliminate choice. A autism will recess it and our answer will be choice be the mode of inheritance of this particular trait. Is autism a dominant? See you in the next video.

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Consider the following pedigree. Predict the mode of inheritance of the trait of interest and the most probable genotype of each individual. Assume that the alleles A and a control the expression.