Heterodoxy
发表于 2025-3-25 03:30:08
Victoria Slettli,Xiang Ying Meiis process are conserved between these classes of vertebrates. The genetic mechanism by which sex is determined in birds remains to be elucidated, although recent studies have reinforced the contention that steroids may play an important role in the structural development of the testes and ovaries i
Fracture
发表于 2025-3-25 07:49:41
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文艺
发表于 2025-3-25 14:19:15
Charles S. Spencer,Elsa M. Redmond, and data about sex-determining genes in the Amphibia have been compiled. Thorough cytogenetic analyses have shown that both XY/XX and ZW/ZZ sex chromosomes exist in the order Anura and Urodela. In some species quite unusual systems of sex determination have evolved (e.g. 0W-females/00-males or the
PAEAN
发表于 2025-3-25 18:19:20
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勾引
发表于 2025-3-25 22:52:00
https://doi.org/10.1007/978-3-0348-7781-7Chromosom; Termination; Vertebrate; chromosome; development; fish; genes; mammals; vertebrates; Model vertebr
混沌
发表于 2025-3-26 02:30:20
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ungainly
发表于 2025-3-26 06:48:21
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indigenous
发表于 2025-3-26 09:26:00
The one-to-four rule and paralogues of sex-determining genes, than the invertebrates: 60000 vs. 15000. Consequently, each invertebrate gene has been amplified to the maximum of four paralogous genes in vertebrates: the one-to-four rule. When this rule is applied to genes pertinent to gonadal development and differentiation, the following emerged: (i) Two clos
interlude
发表于 2025-3-26 12:48:48
Genes essential for early events in gonadal development,s that genetic sex — determined at fertilization by the presence or absence of the Y chromosome — directs the embryonic gonads to differentiate into either testes or ovaries. Thereafter, hormones produced by the testes direct the developmental program that leads to male sexual differentiation. In th
竞选运动
发表于 2025-3-26 17:04:15
, and mammalian sex determination,cription factor that is known to bind to specific target sequences in DNA and to cause a bend in the chromatin. DNA bending appears to be part of the mechanism by which . influences transcription of genes downstream in a cascade of gene regulation leading to maleness, but the factors that cooperate