The greatest of all mammals is the platypus, sometimes called the duckbilled platypus. Their bills have a variety of shapes naturally: flat, bowed, rounded and flexible, but the normal appearance is the broad bill. At the San Diego Zoo Safari Park they have been keeping track of their platypuses, noting the genetics shown below. The F1 were self-crossed to yield the F2. All original crosses were true breeding. Original Cross Rounded x Bowed Flat x Bowed Rounded x Flat Broad x Bowed F₁ 100% Bowed 100% Flat 100% Flat 100% Broad F₂ 71% Bowed, 29% Rounded 75% Flat, 25% Bowed 72% Flat, 28% Rounded 77% Broad, 17% Bowed, 6% Concave • Derive the allelic series • Explain the genetics of the last cross. Be specific. • Write down a null hypothesis for the last cross, assuming you were testing its validity using a chi square analysis.

The greatest of all mammals is the platypus, sometimes called the duckbilled platypus. Their bills have a variety of shapes naturally: flat, bowed, rounded and flexible, but the normal appearance is the broad bill. At the San Diego Zoo Safari Park they have been keeping track of their platypuses, noting the genetics shown below. The F1 were self-crossed to yield the F2. All original crosses were true breeding. Original Cross Rounded x Bowed Flat x Bowed Rounded x Flat Broad x Bowed F₁ 100% Bowed 100% Flat 100% Flat 100% Broad F₂ 71% Bowed, 29% Rounded 75% Flat, 25% Bowed 72% Flat, 28% Rounded 77% Broad, 17% Bowed, 6% Concave • Derive the allelic series • Explain the genetics of the last cross. Be specific. • Write down a null hypothesis for the last cross, assuming you were testing its validity using a chi square analysis.

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter5: The Inheritance Of Complex Traits

Section: Chapter Questions

Problem 7QP: Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 20-cm flowers. The F1...

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Question

The greatest of all mammals is the platypus, sometimes called the duckbilled platypus. Their bills have a
variety of shapes naturally: flat, bowed, rounded and flexible, but the normal appearance is the broad
bill. At the San Diego Zoo Safari Park they have been keeping track of their platypuses, noting the
genetics shown below. The F1 were self-crossed to yield the F2. All original crosses were true breeding.
Original Cross
F1
100% Bowed
F2
71% Bowed, 29% Rounded
75% Flat, 25% Bowed
Rounded x Bowed
Flat x Bowed
100% Flat
Rounded x Flat
100% Flat
72% Flat, 28% Rounded
Broad x Bowed
100% Broad
77% Broad, 17% Bowed, 6% Concave
Derive the allelic series
• Explain the genetics of the last cross. Be specific.
Write down a null hypothesis for the last cross, assuming you were testing its validity using a chi
square analysis.

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