德牧颜色遗传规律

问题描述

精选答案

影响德牧色型的a系复等位基因。考量四种影响着德牧的毛色的隐性基因：它们是纯黑a、铁包金at、黑背as和狼青ay。

纯合黑aa与其他色型的后代

a + a = 纯黑

a + at =铁包金

a + as = 黑背

a + ay = 狼青

纯合铁包金atat与其他色型的后代

at + a =铁包金

at + at =铁包金

at + as = 黑背

at + ay = 狼青

纯合黑背asas与其他色型的后代

as + a = 黑背

as + at = 黑背

as + as = 黑背

as + ay = 狼青

纯合狼青ayay与其他色型的后代

ay + a = 狼青

ay + at = 狼青

ay + as = 狼青

ay + ay = 狼青

统计可知：在16个理论后代中，狼青占7，黑背占5，铁包金占3，纯黑占1.。这就是在不分色型的繁育中，德牧后代的大致比例。