منابع مشابه
Genome size and intron size in Drosophila.
Petrov, Lozovskaya, and Hartl (1996) demonstrated that unconstrained regions of the non-long terminal repeat retrotransposable element Helena lose DNA at an unusually high rate in species of the Drosophila virilis species group. More recent data also indicate a high rate of DNA loss of Helena in species of the Drosophila melanogaster species subgroup (Petrov and Hartl 1998). Based on these obse...
متن کاملIntron size and genome size in plants.
It has long been known that genomes vary over a remarkable range of sizes in both plants (Bennett, Cox, and Leitch 1997) and animals (Gregory 2001). It also has become evident that across the broad phylogenetic sweep, genome size may be correlated with intron size (Deutsch and Long 1999; Vinogradov 1999; McLysaght et al. 2000), suggesting that some component of genome size evolution takes place...
متن کاملIntron size and exon evolution in Drosophila.
We have found a negative correlation between evolutionary rate at the protein level (as measured by d(N)) and intron size in Drosophila. Although such a relation is expected if introns reduce Hill-Robertson interference within genes, it seems more likely to be explained by the higher abundance of cis-regulatory elements in introns (especially first introns) in genes under strong selective const...
متن کاملEvolutionary dynamics of intron size, genome size, and physiological correlates in archosaurs.
It has been proposed that intron and genome sizes in birds are reduced in comparison with mammals because of the metabolic demands of flight. To test this hypothesis, we examined the sizes of 14 introns in a nonflying relative of birds, the American alligator (Alligator mississippiensis), and in 19 flighted and flightless birds in 12 taxonomic orders. Our results indicate that a substantial fra...
متن کاملlanguage learning strategies and vocabulary size of iranian efl learners
learning a second or foreign language requires the manipulation of four main skills, namely, listening, reading, speaking, and writing which lead to effective communication. it is obvious that vocabulary is an indispensible part of any communication, so without a vocabulary, no meaningful communication can take place and meaningful communication relies heavily on vocabulary. one fundamental fac...
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ژورنال
عنوان ژورنال: Molecular Biology and Evolution
سال: 1998
ISSN: 0737-4038,1537-1719
DOI: 10.1093/oxfordjournals.molbev.a025980