When the parents have recessive genetic disorder with the genotype gg, there are 100% chances that their second child will develop the disorder.
Genotype is the genetic makeup of an individual. It tells about the set of alleles a person exhibits for a particular trait. Recessive genetic disorder is an autosomal kind of disorder in which both the alleles inherited from the parents should be recessive. Sickle cell disease is an example of recessive genetic disorder.
When both parents are recessive for a trait, only one type of gamete is formed that can give rise to offspring with only the homozygous recessive trait.
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Captive breeding and release programs, widely used to supplement populations of declining species, minimize juvenile mortality to achieve rapid population growth. However, raising animals in benign environments may promote traits that are adaptive in captivity but maladaptive in nature. In chinook salmon, hatchery rearing relaxes natural selection favoring large eggs, allowing fecundity selection to drive exceptionally rapid evolution of small eggs. Trends toward small eggs are also evident in natural populations heavily supplemented by hatcheries, but not in minimally supplemented populations. Unintentional selection in captivity can lead to rapid changes in critical life-history traits that may reduce the success of supplementation or reintroduction programs.
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Calcium is an essential macronutrient for the construction and maintenance of bones and teeth, and is very important for muscle contraction and transmission of nerve impulses.
Because it is widely used by the body, it is essential that calcium is ingested in adequate quantities, especially during childhood, as it is at this stage of life that bones and teeth form, which in the future may function as a reserve of calcium in cases of disability.
