杂种优势 Heterosis
（重定向自Outbreed）
杂种优势（Heterosis）是一个用在遗传学和育种之上的术语。杂种优势是指杂交种通过继承其父母的不同的优势，可能获得一个更好的生物特性（但是也可能杂交后只继承了父母各自的缺点导致变得更差）。
杂种优势一般和近交衰退相对比。
相对的也有远交衰退，如杂种衰败，杂种由于生殖隔离等原因不能产生后代。
outbreed
/aʊt'brid/ /ˈaʊtˌbrid/
英汉-汉英词典
vt. 使远系繁殖
时 态: outbred outbreeding, outbreeds
词组 | 习惯用语
您要查找的是不是：
- outbreak n. （疾病的）发作；（战争的）爆发 vi. 爆发
- outburst n. （火山、情感等的）爆发；破裂
- outboard adj. 外侧的；船外的 adv. 在舷外，在外部
- rerouted v. 改程；改航（reroute的过去式）
outbreed v. 使远系繁殖；远交，非亲缘交配；实行婚外制
网络短语:
outbreed d 远系繁殖
英语例句库
- Changes to cancer genes endow the cell with one or more superpowers, allowing it to outbreed its neighbors.
癌症基因上头出现的变化，赋予了细胞一或多种的超能力，使其比邻近细胞长得更快。 - <P>Chinese Kun Ming (KM) mouse, an outbreed strain of laboratory animal, has been widely utilized in related pharmaceutical and genetic studies throughout China.
在我国，昆明小鼠作为一种实验动物广泛应用于药理和遗传学相关的研究领域。
声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
中文百科
英语百科
Heterosis 杂种优势
（重定向自Outbreed）
![A mixed-breed dog](/Images/godic/202501/31/MixedBreedFace1_wb4626.jpg")
![Genetic basis of heterosis.
Dominance hypothesis. Scenario A.
Fewer genes are under-expressed in the homozygous individual. Gene expression in the offspring is equal to the expression of the fittest parent.
Overdominance hypothesis. Scenario B.
Over-expression of certain genes in the heterozygous offspring.
(The size of the circle depicts the expression level of gene A)](/Images/godic/202501/31/Heterosis.svg4626.png")
Heterosis, hybrid vigor, or outbreeding enhancement, is the improved or increased function of any biological quality in a hybrid offspring. The adjective derived from heterosis is heterotic.
An offspring exhibits heterosis if its traits are enhanced as a result of mixing the genetic contributions of its parents. These effects can be due to Mendelian or non-Mendelian inheritance.
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