| 词汇 | example_english_self-fertilization |
| 释义 | Examples of self-fertilizationThese 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. The evolution of self-fertilization and inbreeding depression in plants. No progeny were identified as the products of self-fertilization in this population. Broadly speaking, greater self-fertilization decreases element number under deleterious insertion and increases element number with regulation through ectopic exchange. However, self-fertilization should be interpreted cautiously with respect to only 8 loci in a relatively small number of individuals analysed. Such expectations are badly needed to built realistic models of the evolution of self-fertilization. In order for reproduction by self-fertilization to evolve, the advantages must outweigh any possible disadvantage of inbreeding. The genetic variability is therefore expected to be halved in populations with very high frequencies of self-fertilization. Also, self-fertilization, as mentioned above, is expected to promote local population differentiation. Suppose the offspring is to be produced through self-fertilization. Some reproductive factors affecting the selection of self-fertilization in plants. Animals mix it up too: the distribution of self-fertilization among hermaphroditic animals. Eggs are produced by self-fertilization (most trematodes are hermaphroditic), bypassing the need for the worm to mature in a definitive host. Outbreeding, self-fertilization, gynogenesis and triploidy would influence the recombination of alleles between individuals and hence the degree of genetic diversity generated by each fluke. Under these circumstances, homozygosity associated with self-fertilization is ineffective at reducing average element number. Expectations for inbreeding depression on self-fertilization of tetraploids. On the whole, the self-fertilization depression was extremely low in both populations. This probably reflects the low equilibrium frequency expected under self-fertilization, with small fluctuations in average element number sufficient to result in element loss. Many hermaphroditic parasites reproduce by both cross-fertilization and self-fertilization. However, as some vector snails and most flukes are hermaphroditic, self-fertilization becomes an open option. This occurs because self-fertilization increases the proportion of homozygous genotypes and leads to the elimination of recessive and partially recessive deleterious alleles. Ecological and genetical factors directing the evolution of self-fertilization. On the whole, these results suggest that self-fertilization depression is nonexistent to low. 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. |
反思网英语在线翻译词典收录了377474条英语词汇在线翻译词条，基本涵盖了全部常用英语词汇的中英文双语翻译及用法，是英语学习的有利工具。