metafemale
metafemale A fruit fly (
Drosophila sp.) with three instead of the normal two X chromosomes. In such flies the disproportion of sex chromosomes to autosomes leads to impaired development and often failure to emerge from the pupae. Compare
metamale.
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Evolutionary History of Silene latifolia Sex Chromosomes Revealed by Genetic Mapping of Four Genes
Magazine article from: Genetics; 6/1/2005; ; 700+ words
; ABSTRACT The sex chromosomes of dioecious white campion, Silene...trace the origin and evolution of sex chromosomes in this genus by comparing closely...Silene species with and without sex chromosomes. Here I demonstrate that four...
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Independent Origin of Sex Chromosomes in Two Species of the Genus Silene
Magazine article from: Genetics; 6/1/2008; ; 700+ words
; ...male heterogametic species, but its sex chromosomes have evolved from a different pair...this genus have evolutionarily recent sex chromosomes (~10-20 MYA, according to BERGERO...search for autosomal ancestors of the sex chromosomes. To date, the attention of researchers...
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Scientists Discover Papaya Have Sex Chromosomes.
News Wire article from: Ascribe Higher Education News Service; 1/21/2004; 700+ words
; ...Newswire) -- Research has uncovered sex chromosomes, rare in plants, in papaya plants...one, "may shed new light on how sex chromosomes evolve," said Andrew Paterson...project. The newly revealed papaya sex chromosomes appear to have formed in the last...
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 "Genome Biology (Online Edition)")
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The multiple sex chromosomes of platypus and echidna are not completely identical and several share homology with the avian Z.(Research)
Magazine article from: Genome Biology (Online Edition); 11/16/2007; ; 700+ words
; ...chromosomes consisted of five X and five Y sex chromosomes. The ten sex chromosomes form a multivalent chain at meiosis held...function and evolution of the platypus multiple sex chromosomes, we defined the sex chromosomes of the...
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Sex chromosomes linked to evolution of new species.
News Wire article from: Asian News International; 9/28/2009; 700+ words
; ...first time that the evolution of new sex chromosomes is the driving force behind the formation...scientists found that the emergence of new sex chromosomes caused a population of threespine...Sea stickleback fish had different sex chromosomes compared to their ancestors. The...
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Fungi may help unravel the origin of sex chromosomes
News Wire article from: The Hindustan Times; 3/18/2008; 563 words
; ...of the evolutionary development of sex chromosomes. In the plant and animal kingdoms...of a few specific genes. In humans sex chromosomes help determine sex. It is thought...long period of time. "In humans, sex chromosomes are believed to have developed over...
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Cloning and characterization of dispersed repetitive DNA derived from microdissected sex chromosomes of Rumex acetosa.
Magazine article from: Genome; 2/1/2006; ; 700+ words
; ...structure and evolution of plant sex chromosomes, we have generated a sex chromosome...evolution of the heteromorphic sex chromosomes of R. acetosa is discussed. Key words: Rumex acetosa, sex chromosomes, microdissection, evolution...
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Mechanism for evolution of sex chromosomes identified by scientists.
News Wire article from: Asian News International; 10/5/2009; 700+ words
; ...biologists have genetically mapped the sex chromosomes of several species of cichlid fish...identified a mechanism by which new sex chromosomes may evolve. The research, by biologists...rapidly, and the differences between sex chromosomes are harder to observe. Even sister...
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Sex chromosomes are influential even before gonadal hormones kick in.
Newspaper article from: Pain & Central Nervous System Week; 4/5/2004; 685 words
; ...APR 5 - (NewsRx.com & NewsRx.net) -- Sex chromosomes are influential even before gonadal hormones kick...published their study in Endocrinology (Minireview: Sex chromosomes and brain sexual differentiation. Endocrinology...
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Evolution of Amino-Acid Sequences and Codon Usage on the Drosophila miranda Neo-Sex Chromosomes
Magazine article from: Genetics; 12/1/2006; ; 700+ words
; ...genes (BARTOLOM et al. 2005), in contrast with the apparent accumulation of unpreferred codons detected on both neo-sex chromosomes (BACHTROG 2003b, 2005). While a relaxation of selection on codon usage bias on the neo-Y chromosome is in accord with...
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metafemale
Book article from: A Dictionary of Biology
metafemale A fruit fly ( Drosophila sp.) with three instead of the normal two X chromosomes. In such flies the disproportion of sex chromosomes to autosomes leads to impaired development and often failure to emerge from the pupae. Compare metamale .
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metamale
Book article from: A Dictionary of Biology
...disproportion of autosomes to the normal complement of one X chromosome (plus one Y chromosome, which plays little or no part in sex determination) impairs development, and such flies are typically weak and sterile. Compare metafemale .
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