Results 211 to 220 of about 4,675,098 (246)

Evolution: The oldest sex chromosomes

Current Biology, 2021
The first sex chromosomes in plants were described in bryophytes, and liverwort genome sequences reported in a new study are now starting to help us understand the similarities and differences in the evolution of haploid and diploid systems.
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A new model of sex chromosome evolution

Science, 2022
A new model, based on the evolution of gene regulation, challenges the classical ...
Pavitra, Muralidhar, Carl, Veller
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THE EVOLUTION OF HETEROMORPHIC SEX CHROMOSOMES

Biological Reviews, 1990
SUMMARYThe facts and ideas which have been discussed lead to the following synthesis and model. Heteromorphic sex chromosomes evolved from a pair of homomorphic chromosomes which had an allelic difference at the sex‐determining locus. The first step in the evolution of sex‐chromosome heteromorphism involved either a conformational or a structural ...
E, Jablonka, M J, Lamb
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The Evolution of Sex Chromosomes

Science, 1991
Structurally distinct sex chromosomes (X and Y) are the most familiar mode of genetic sex determination and have evolved independently in many different taxa. The evolutionary paths by which their characteristic properties may have evolved are reviewed.
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Plant sex chromosome evolution

Journal of Experimental Botany, 2012
It is now well established that plants have an important place in studies of sex chromosome evolution because of the repeated independent evolution of separate sexes and sex chromosomes. There has been considerable recent progress in studying plant sex chromosomes.
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Sex Chromosome Evolution and Haldane's Rule

Journal of Heredity, 1997
Haldane observed that where interspecies hybrids show sex differences in sex ratio or fertility, it is always heterogametic sex which is affected. Many hypotheses have been advanced to explain Haldane's rule, but it is difficult to find a unifying explanation that will accommodate male and female heterogamety, and explains why fertility, especially, is
J A, Graves, R J, O'Neill
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The evolution of sex chromosomes

2014
Abstract The chromosomes carrying the genes that determine sexes or mating types often show strong heteromorphy. This chapter discusses the evolutionary trajectories of sex chromosomes, from the initial acquisition of a sex-determining gene, to the linkage of sexually antagonistic genes, and the suppression of recombination.
Leo W. Beukeboom, Nicolas Perrin
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Retroelements: tools for sex chromosome evolution

Cytogenetic and Genome Research, 2005
Many eukaryotic taxa inherit a heteromorphic sex chromosome pair. It is a generally accepted hypothesis that the sex chromosome pair is derived from a pair of homologous autosomes that has developed after the occurrence of a sex differentiator in an evolutionary process into two structurally and functionally different partners.
S, Steinemann, M, Steinemann
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Satellite DNA and evolution of sex chromosomes

Chromosoma, 1976
The satellite DNA (SATELLITE III) which is mainly represented in the female of Elaphe radiata (Ophidia, Colubridae) has been isolated and its buoyant density has been determined (delta equals 1.700 g cm-3). In situ hybridisation of radioactive complementary RNA of this satellite DNA with the chromosomes of different species has revealed that it is ...
L, Singh, I F, Purdom, K W, Jones
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Evolution and regulation of animal sex chromosomes

Nature Reviews Genetics
Animal sex chromosomes typically carry the upstream sex-determining gene that triggers testis or ovary development and, in some species, are regulated by global dosage compensation in response to functional decay of the Y chromosome. Despite the importance of these pathways, they exhibit striking differences across species, raising fundamental ...
Zexian Zhu, Lubna Younas, Qi Zhou
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