&lt;p&gt;Partie 4: G&eacute;n&eacute;tique humaine&amp;nbsp;&lt;/p&gt;&lt;p&gt;Introduction&lt;/p&gt;&lt;p&gt;&lt;span style=&quot;font-weight: bolder;&quot;&gt;&lt;span times=&quot;&quot; new=&quot;&quot; roman&quot;,serif;mso-ascii-theme-font:major-bidi;=&quot;&quot; mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi;color:red&quot;=&quot;&quot; style=&quot;font-size: 14pt; line-height: 19.9733px;&quot;&gt;I. La g&eacute;n&eacute;tique humaine : difficult&eacute;s d&rsquo;&eacute;tude et certains moyens utilis&eacute;s.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span times=&quot;&quot; new=&quot;&quot; roman&quot;,=&quot;&quot; serif;=&quot;&quot; color:=&quot;&quot; rgb(0,=&quot;&quot; 176,=&quot;&quot; 80);&quot;=&quot;&quot; style=&quot;font-size: 12pt; line-height: 17.12px;&quot;&gt;1. Difficult&eacute;s d&rsquo;&eacute;tude de la g&eacute;n&eacute;tique humaine :&lt;/span&gt;&amp;nbsp;&lt;/p&gt;&lt;p&gt;&lt;span times=&quot;&quot; new=&quot;&quot; roman&quot;,=&quot;&quot; serif;=&quot;&quot; color:=&quot;&quot; rgb(0,=&quot;&quot; 176,=&quot;&quot; 80);&quot;=&quot;&quot; style=&quot;font-size: 12pt; line-height: 17.12px;&quot;&gt;2. Certains moyens d&rsquo;&eacute;tude de la g&eacute;n&eacute;tique humaine :&lt;/span&gt;&lt;/p&gt;