viability$90205$ - ترجمة إلى اليونانية
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viability$90205$ - ترجمة إلى اليونانية

ABILITY OF A FETUS TO SURVIVE OUTSIDE THE UTERUS
Point of fetal viability; Period of viability; Period of Viability; Limit of viability; Viability (fetus); Viability of fetus; Viability (fetal); Foetal viability; Roe standard; Periviability
  • Stages in [[prenatal development]], showing ''viability'' and point of 50% chance of survival (''limit of viability'') at bottom. Weeks and months numbered by gestation,

viability      
n. βιωσιμότητα, βιώσιμο
natural selection         
  • resistance to antibiotics]] grows through the survival of individuals less affected by the antibiotic. Their offspring inherit the resistance.
  • [[Aristotle]] considered whether different forms could have appeared, only the useful ones surviving.
  • pages=66–67}}</ref>
  • 1: [[directional selection]]: a single extreme [[phenotype]] favoured.<br>2, [[stabilizing selection]]: intermediate favoured over extremes.<br>3: disruptive selection: extremes favoured over intermediate.<br>X-axis: [[phenotypic trait]]<br>Y-axis: number of organisms<br>Group A: original population<br>Group B: after selection
  • Pouters]] (14) by [[selective breeding]].
  • morph]] of the [[peppered moth]] largely replaced the formerly usual light morph (both shown here). Since the moths are subject to [[predation]] by birds hunting by sight, the colour change offers better [[camouflage]] against the changed background, suggesting natural selection at work.
  • life cycle stage]] of a sexually reproducing organism.<ref name=Christiansen1984/>
  • Essay on the Principle of Population]]'', 6th edition, 1826
  • coloration]] through [[mate choice]] by females over many generations.
DIFFERENTIAL SURVIVAL AND REPRODUCTION OF INDIVIDUALS DUE TO DIFFERENCES IN PHENOTYPE; A KEY MECHANISM OF EVOLUTION
Natural Selection; Darwinian selection; Selection (biology); Evolutive pressure; Evolution by natural selection; Differential reproduction; Variation and selection; Variation and Selection; Natural enemies; Darwinian Selection; Exploitation competition; Natural Select; Natural selection theory; Viability selection; Theory of natural selection; Selection of the fittest; Theory of evolution by natural selection; Ecological competitor; Evolutionary selection; Competition of resources; Random-bred; Naturally selected; Selection (genetics); Selection (evolutionary biology); Selection (evolution); Pre-Darwinian evolution; Darwinian struggle; Viable material
φυσική επιλογή

تعريف

viable
['v???b(?)l]
¦ adjective
1. capable of working successfully; feasible.
2. Biology (of a plant, animal, or cell) capable of surviving or living successfully.
Botany (of a seed or spore) able to germinate.
Medicine (of a fetus or unborn child) able to live after birth.
Derivatives
viability noun
viably adverb
Origin
C19: from Fr., from vie 'life'.

ويكيبيديا

Fetal viability

Fetal viability is the ability of a human fetus to survive outside the uterus. Medical viability is generally considered to be between 23 and 24 weeks gestational age. Viability depends upon factors such as birth weight, gestational age, and the availability of advanced medical care. In low-income countries, half of newborns born at or below 32 weeks gestational age died due to a lack of medical access; in high-income countries, the vast majority of newborns born above 24 weeks gestational age survive.

As of 2022, the world record for the lowest gestational age newborn to survive is held by Curtis Zy-Keith Means, who was born on 5 July 2020 in the United States, at 21 weeks and 1 day gestational age, weighing 420 grams.