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The chicken embryo is a unique model that overcomes many limitations to studying the biology of cancer in vivo. The chorioallantoic membrane (CAM), a well-vascularized extra-embryonic tissue located underneath the eggshell, has a successful history as a biological platform for the molecular analysis of cancer including viral oncogenesis, [8] carcinogenesis, [9] tumor xenografting, [1] [10] [11 ...
The soft feathers on the underside of the bird Lesser sickles Long curved feathers of the tail, below the sickles only in cock birds Main tail feathers The long straight feathers forming the tail, under the tail coverts Muff Feathers projecting below and around the eyes only in bearded breeds Neck hackles The long feathers of the neck
A frizzle refers to a plumage pattern in domesticated chickens (Gallus gallus domesticus) characterized by feathers that curl outwards, rather than lying flat as in most chickens. The frizzle type is not a separate breed , but a variety within breeds.
Figure 1. Feathering types in ten-day-old chicks.Left: Fast normal-feathering chick. Right: Delayed-feathering chick carrying sex-linked K gene. Delayed-feathering in chickens is a genetically determined delay in the first weeks of feather growing, which occurs normally among the chicks of many chicken breeds and no longer manifests itself once the chicken completes adult plumage.
In the U.S., 9 billion of these animals are killed every year for meat, and chicken feathers are one of the largest byproducts of the poultry industry as a result. Every year, an estimated 40 ...
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Laboratory mice, widely used in medical research. Among invertebrates, the fruit fly Drosophila melanogaster is famous as the subject of genetics experiments by Thomas Hunt Morgan and others. They are easily raised in the lab, with rapid generations, high fecundity, few chromosomes, and easily induced observable mutations. [88]