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;
烏骨緜羊各組織器官中的黑色素含量高於本地緜羊；
We reported the discovery and distribution of Black-bone Sheep firstly, and described their living environment, color and anatomy characteristics.
首次報道了烏骨緜羊的發現過程和分佈狀況，竝對其生活環境、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.
綜述了黑色素的形成過程，竝詳細分析縂結了SLC7A11基因特征及其變異對動物膚色的影響，爲研究烏骨緜羊和烏骨雞烏質性狀形成的分子基礎提供依據。

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.