In order to promote interdisciplinary learning, the Harvard's 26th president Neil L. Rudenstine announced in 1999 the foundation of Radcliffe Institute of Advanced Study, which was created through the merger of Radcliffe College with Harvard.
A.
Y
B.
N
C.
NG
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【单选题】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 ( )