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.11 - Cell Signaling
Ch.12 - Cell Division
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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
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Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
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Ch.28 - Prokaryotes
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Ch.30 - Plants
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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: in sesame plants, the one-pod condition (P) is dominant to the three-pod condition (p), and normal leaf (L) is dominant to wrinkled leaf (l). Pod type and leaf type are inherited independently. Determine the genotypes as best as you can for the two parents for all possible matings producing the following offspring.a) 318 one-pod normal, 98 one-pod wrinkledb) 74 one-pod normal, 72 one-pod wrinkled, 76 three-pod normal, 72 three-pod wrinkled

Problem

in sesame plants, the one-pod condition (P) is dominant to the three-pod condition (p), and normal leaf (L) is dominant to wrinkled leaf (l). Pod type and leaf type are inherited independently. Determine the genotypes as best as you can for the two parents for all possible matings producing the following offspring.

a) 318 one-pod normal, 98 one-pod wrinkled

b) 74 one-pod normal, 72 one-pod wrinkled, 76 three-pod normal, 72 three-pod wrinkled

Solution

a) This has a 3:1 ratio for one-pod normal to one-pod wrinkled.

Having no three-pod variant, this should mean that on of the parents should be homozygous dominant, regardless of the genotype of the other.

A 3:1 ratio of normal to wrinkled leaves could only mean that it is a heterozygous cross. 

The two information lead us to conclusion that there are three possible matings for this outcome:

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