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Biology: The Unity and Diversity o...

0th Edition
STARR
ISBN: 9780357093795

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Chapter
Section
FindFindarrow_forward

Biology: The Unity and Diversity o...

0th Edition
STARR
ISBN: 9780357093795

Textbook Problem

A "calico" cat (left) is mainly while with patches of black and orange fur.

  1. a. Almost all calico cats are female. Why?
  2. b. Why do you think that, of the few male calico cats that are born, almost all are sterile.
  3. c. Each calico cat has a unique pattern of white, black, and orange fur. Review Figure 10.7, then propose a mechanism that would give rise to the white fur.

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A.

Summary Introduction

To determine: Why calico cats are almost female.

Concept introduction: Some of the cats are white with patches of two colors (usually black and orange). Such cats are called as calico cats. The coat colors in them are determined and are associated with the X chromosomes. Most of the calico cats are females. One of their color coats is determined by the maternal X chromosome and the other with the paternal X chromosome. Males are rare as they have only one sex chromosome and mostly the males are often sterile.

B.

Summary Introduction

To determine: Why the calico cats are rare and sterile.

Concept introduction: Some of the cats are white with patches of two colors (usually black and orange). Such cats are called as calico cats. The coat colors in them are determined and are associated with the X chromosomes. Most of the calico cats are females. One of their color coats is determined by the maternal X chromosome and the other with the paternal X chromosome. Males are rare as they have only one sex chromosome and mostly the males are often sterile.

C.

Summary Introduction

To propose: A mechanism that would give rise to the white fur.

Concept introduction: Some of the cats are white with patches of two colors (usually black and orange). Such cats are called as calico cats. The coat colors in them are determined and are associated with the X chromosomes. Most of the calico cats are females. One of their color coats is determined by the maternal X chromosome and the other with the paternal X chromosome. Males are rare as they have only one sex chromosome and mostly the males are often sterile.

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