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
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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
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Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
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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: In cats, the hair can be either short or long (angora). A cat fancier made the following crosses with results shown below:a. Which phenotype is dominant?b. What are the genotypes of the parents and offspring of the crosses?c. If the short-haired offspring from cross 3 were bred to their short parent, what kinds of kittens would be expected and in what proportions?d. If the short-haired offspring from cross 3 were bred to the short-haired parent ofcross 2, what kinds of kittens would be expected and in what proportions?

Problem

In cats, the hair can be either short or long (angora). A cat fancier made the following crosses with results shown below:

a. Which phenotype is dominant?

b. What are the genotypes of the parents and offspring of the crosses?

c. If the short-haired offspring from cross 3 were bred to their short parent, what kinds of kittens would be expected and in what proportions?

d. If the short-haired offspring from cross 3 were bred to the short-haired parent ofcross 2, what kinds of kittens would be expected and in what proportions?

Solution

The hair length of cats is known to assort independently from the other genes. In this trait, there are two possiblephenotypes: the short and long (angora). In the given crosses, it is the second cross that could give us a clue on which character is dominant and which is recessive.

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