词汇 | recessive |
释义 | recessive adjective biology specializeduk /rɪˈses.ɪv/ us /rɪˈses.ɪv/ (of genes and the physical qualities they control) only appearing in a child if both parents supply the controlling gene(遗传基因)隐性的 Compare dominantadjectivespecialized Genetics accession number adenine anaphase autosomal autosomally dizygotic genetically genetically engineered geneticist genic genomic genomics monozygotic mutate non-Darwinian non-familial non-genetic non-mutant nondominant sex-linked recessive | American Dictionaryrecessive adjective us/rɪˈses·ɪv/ biology of or relating to a gene (= chemical pattern) that causes a particular characteristic only when it is passed on by both parents Examples of recessiverecessive For reasons described previously, deleterious mutations that persist in a population are likely to be at least partially recessive in their effects on fitness. If deleterious mutations tend to be more recessive than beneficial mutations, we will score a higher proportion of the beneficial than the deleterious mutations. One possibility, which has some parallels in other species, is the presence of recessive lethal genes which cause embryonic death in the homozygote. A case where such a mild form of inbreeding could be crucial is when mutations are extremely recessive. We will assume that mutations are at least partly recessive (h 1\\2). The interaction between selection against partially recessive mutations and genetic drift in small populations also influences the rate of decay of neutral variation. High inbreeding depression, selective interference among loci and the threshold selfing rate for purging recessive lethal mutations. The first cases described were offspring of consanguineous parents who were both carriers of a recessive mutation. In these cases, two linked, partially recessive loci can behave like an overdominant one. In the last seven years we have mapped 10 new genes for various recessive diseases and identified 3 novel mutations. The recessive mutation tufted was used as a reliable genetic marker to trace transmission of the homologous chromosomes. This reasoning applies only to tetraploid populations under the ' duplex-mutation ' model of dominance or for completely recessive mutations. Thereafter, every retransformation is recessive, little by little losing its energy until at the end it fades completely. If an individual with a recessive trait marries, then all his children will be carriers as they must receive one of the genes. These mutations appear to be inherited in an autosomal recessive manner. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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