black sheep

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Melanin content in the tissues and organs in black bone sheep was higher than that in non-black bone sheep;
乌骨绵羊各组织器官中的黑色素含量高于本地绵羊；
We reported the discovery and distribution of Black-bone Sheep firstly, and described their living environment, color and anatomy characteristics.
首次报道了乌骨绵羊的发现过程和分布状况，并对其生活环境、外貌和解剖特征作了描述。
This review emphasizes the characteristics and mutation of SLC7A11 gene and their effect on coat color, which will provide molecular basis on black traits of the Black-boned sheep and silky fowl.
综述了黑色素的形成过程，并详细分析总结了SLC7A11基因特征及其变异对动物肤色的影响，为研究乌骨绵羊和乌骨鸡乌质性状形成的分子基础提供依据。

In Fylingdales, among the black-faced sheep of northern Yorkshire, sits a radar station built by the U.S. If expanded, it could well become an outpost much needed to track missiles on their way to North America and to plot their interception.
CENTERFORSECURITYPOLICY: Safire makes the case for a missile defense for allies and US
Pinot Gris (pronounced "gree") is the black sheep, or anyway, the purple-brown sheep, of one of the grape world's most noble families.
FORBES: Pinot Gris makes the Pinot family proud.
The GAO speculates that the dollar coin might cause a renewed interest in that black sheep of the currency family, the two-dollar bill (which features Thomas Jefferson).
FORBES: GAO Proposed Ditching Dollar Bill in Favor of Coin

a person who has done something bad that brings embarrassment or shame to his or her family

If you describe someone as the black sheep of their family or of a group that they are a member of, you mean that they are considered bad or worthless by other people in that family or group.