LIFE: THE SCIENCE OF BIOLOGY
LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 9781319145125
Author: Sadava
Publisher: MAC HIGHER
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Chapter 12, Problem 4Q
Summary Introduction

To explain:

The cross-over between chromosomes containing genes DDbb and ddBB during meiosis and representation of chromatids and chromosomes before, during, and after crossing over, with the help of a diagram.

Introduction:

A crossing over occurs between chromosomes during meiosis. The meiosis the part of cell-cycle, during, which the genetic material from both the parents gets exchanged. A synapse is formed at the prophase 1 of the meiosis, which is followed by the cross-over between two chromosomes. During a cross-over a new type of phenotype is formed, representing recombinants that are different from either parent.

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You aim to test the hypothesis that the Tbx4 and Tbx5 genes inhibit each other's expression during limb development. With access to chicken embryos and viruses capable of overexpressing Tbx4 and Tbx5, describe an experiment to investigate whether these genes suppress each other's expression in the limb buds. What results would you expect if they do repress each other? What results would you expect if they do not repress each other?
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Cell Division - Mitosis and Meiosis - GCSE Biology (9-1); Author: Mr Exham Biology;https://www.youtube.com/watch?v=w7vp_uRA8kw;License: Standard YouTube License, CC-BY