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
Ch.30 - Plants
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: The given pedigree below is of a genetic condition which gives affected individuals a star-shaped mark on their neck. The shaded individuals all carry this mark.A. Is this an example of a dominant or recessive pedigree? How do you know?B. What is the genotype of I1 and I2?C. What is the chance that the offspring of III-2 and III-5 will be affected? What about if III-3 and III-5 mated?

Problem

The given pedigree below is of a genetic condition which gives affected individuals a star-shaped mark on their neck. The shaded individuals all carry this mark.

A. Is this an example of a dominant or recessive pedigree? How do you know?

B. What is the genotype of I1 and I2?

C. What is the chance that the offspring of III-2 and III-5 will be affected? What about if III-3 and III-5 mated?

Solution

Following the basics of pedigree, the shaded individuals are affected, the square are the males and the circles are the females. Pedigree analysis cannot really bring up the genotypes of the individuals. With it, it can be seen that in the frst generation, only the mae is affected. In generation 2, 2 sisters and a boy were affected. Lastly, III-3 is the only individual affected in the 3rd generation.

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