Ch.14 - Mendelian GeneticsWorksheetSee all chapters
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Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
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Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology

Solution: Given the information about mitochondrial inheritance as an example of extrachromosomal inheritance, answer the questions that follow.- Mitochondria contain their own DNA- The female gamete (egg) cont

Problem

Given the information about mitochondrial inheritance as an example of extrachromosomal inheritance, answer the questions that follow.

- Mitochondria contain their own DNA

- The female gamete (egg) contains cytoplasm and mitochondria

- The male gamete (sperm) has no cytoplasm or mitochondria, and is streamlined to a nucleus and flagellum-like structure for motility

- Thus, mitochondrial inheritance of daughters and sons must be traced back through the matrilineal line (mothers only)

The pedigree in the figure below shows a family in which an inherited disease called Leber's opticatrophy is segregating. This condition causes blindness in adulthood. Studies have recently shown that the mutant gene causing Leber's optic atrophy is located in the mitochondrial genome.

Assuming II-4 marries a normal person, what proportion of his offspring should inherit Leber's optic atrophy?

A. 100%

B. 50%

C. 25%

D. 0%

Solution

The pedigree is a diagram showing a subject trait as it is shown across generations of a family. In this diagram, males are represented by squares and females are represented by circles. The individuals who show the trait are shown as shaded shapes.

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