Use the blank pedigrees provided to depict transmission of

Question

(a) an X-linked recessive trait and

(b) an X-linked dominant trait, by filling in circles and squares to represent individuals with the trait of interest. Give genotypes for each person in each pedigree.

Carefully design each transmission pattern so that pedigree

(a) cannot be confused with autosomal recessive transmission and pedigree

(b) cannot be confused with autosomal dominant transmission. Identify the transmission events that eliminate the possibility of autosomal transmission for each pedigree.

Two blank pedigrees illustrating X-linked recessive (a) and X-linked dominant (b) trait inheritance patterns.

Accepted Answer

Hello, everyone. Let's look at our next question. It says which of the following statements is false about pedigree analysis. So let's look through our answer choices here and we'll start with choice. A, the individuals and their relationships are depicted pictorially in the form of geometrical figures and lines and a pedigree chart. Well, this is true. Different shapes are used to indicate the sex of the individuals. They can be shaded or unshaded to determine if to depict whether an individual is affected by a condition and lines are used to indicate their relationship to each other. So marriages, parent, child relationships. And so since that's true, it's not our answer choice. We're looking for a false statement. So we'll cross that out. Choice B says hollow or unfit filled figures represent affected individuals. Well, this will be our false statement shaded in figures represent affected individuals, hollow or unfilled figures represent unaffected individuals. So that's going to be our answer choice B here. But to be through, we will go on and look at our other answer choices. Choice. He says we can identify monotypes, identify Jenna types and predict how a trait will be passed down in the future by analyzing a pedigree. Well, this is true. We've seen how we identify phenotype using the shading. But you can also do this for Jenna types. Um If you want to indicate a hetero six individual, you can have the half filled, half unfilled square to show a heterogeneous carrier. And then you can predict how a trait will be passed down because by looking at the pattern of inheritance shown by the pedigree, you can figure out what type of inheritance it is, which will help you to predict how the trade is handed down in the future. So since this is a true statement, choice C is also not an answer. And in choice D says it is very useful for understanding the inheritance of a trait or disease in a family. Well, this also is true. Uh Seeing the information laid out, showing those relationships to each other generations, which individual are affected really helps you to see that pattern. For instance, to distinguish between a dominant and recessive trait, you'd look for skipped generations. Looking at a pedigree makes it very clear when you have generational skipping um or whether each affected individual has an affected parent. So since D is true also to not answer choice, so again, which the following statement is false about pedigree analysis, choice be hollow or unfilled figures represent affected individuals. See you in the next video.

Key Concepts

X-linked Inheritance

Pedigree Analysis

Distinguishing Autosomal from X-linked Traits

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