Campbell Biology
Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 15.4, Problem 1CC
Summary Introduction

To determine: The reason for occurrence of Down syndrome in a child if chromosomal translocation occurs in gonads of the child’s parents, involving attachment of  third copy of chromosome 21 to chromosome 14.

Concept introduction:

Down syndrome is caused by chromosomal aberration in which trisomy of chromosome 21 occurs. The parents of the children with Down syndrome are normal.

Chromosomal translocation is a process in which a part of chromosome does not break during meiosis and is carried to the gamete as it is.

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Find the dental formula and enter it in the following format: I3/3 C1/1 P4/4 M2/3 = 42 (this is not the correct number, just the correct format) Please be aware: the upper jaw is intact (all teeth are present). The bottom jaw/mandible is not intact. The front teeth should include 6 total rectangular teeth (3 on each side) and 2 total large triangular teeth (1 on each side).
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Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY