Reproductive organs, genes

Knobloch, J., Winnen, R., Quack, M., Kunz, W. and Grevelding, C.G. (2002) A novel Syk-family tyrosine kinase from Schistosoma mansoni, which is preferentially transcribed in reproductive organs. Gene 294, 87-97. 

There are, then, two cardinal features of organisms that undergo meiosis and sexual reproduction. First, genes and chromosomes from the two parents can be inherited in various combinations by the offspring. Second, sexual reproduction results in organisms that alternate between haploid and diploid states, even if one or other of these states is much reduced in the life history. 

When chromosomal aberrations are observed in the germinal tissues of intact animals, they produce important evidence as to whether reproductive organs can be affected by the test chemical (J ). Positive findings of specific gene mutations in jjn vitro tests and of chemically induced chromosomal damage in germinal tissues of rodents constitute strong evidence for a chemical s ability to produce heritable effects. 

Eukarya is a group of organisms with a membrane-bound nucleus. They are multicellular and diverse in species machinery. Some eukaryotes have sexual reproduction, and gene exchange can occur also by transduction and transformation. Genetic information is based on several complex RNA polymerases, and translation starts with methionine. Eukarya was long considered as the third major domain of the life tree. Current molecular results... 

Genes stored information about the internal system and allowed cell reproduction. Probably all organisms belonged to one chemotype swapping genes before more restricted chemotypes evolved. 

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