Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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This graph only shows the affected individuals and does not show the presumed carriers.

Transcribed Image Text:**Pedigree Analysis: Determining Trait Inheritance**
**Question:**
Given the following pedigree, is the trait indicated by the darkened shapes a dominant or a recessive trait? How can you tell?
**Explanation:**
The pedigree chart displays a family tree where circles represent females and squares represent males. Darkened shapes indicate individuals who express a particular trait.
**Diagram Description:**
- The top generation shows one male with the trait, indicated by a darkened square, married to a female without the trait, indicated by a white circle.
- In the second generation:
- They have two offspring: one male with the trait and one female without the trait.
- The male with the trait is married to a female without the trait. This couple's offspring consists of three children with the trait and, importantly, two without the trait.
- The female offspring with the trait is married to a male without the trait. This couple has children exhibiting both presence and absence of the trait.
**Analysis:**
The pattern of inheritance in this pedigree suggests that the trait is a dominant trait. This is indicated by:
- The trait appears in every generation, which is typical of dominant traits.
- Affected individuals have at least one affected parent, supporting the notion that the trait does not skip generations.
This analysis indicates that the trait shown in darkened shapes follows a dominant inheritance pattern.
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