已知某种老鼠的体色由常染色体上的基因 A + 、 A 和 a 决定 ,A + ( 纯合会导致胚胎致死 ) 决定黄色 ,A 决定灰色 ,a 决定黑色 , 且 A + 对 A 是显性 ,A 对 a 是显性。下列说法正确的是 ( )
A.
该种老鼠的成年个体最多有 6 种基因型
B.
A + 、 A 和 a 基因遵循基因的自由组合定律
C.
一只黄色雌鼠和一只黑色纯合雄鼠杂交 , 后代可能出现 3 种表现型
D.
基因型均为 A + a 的一对老鼠交配产下了 3 只 , 可能全表现为黄色
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