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Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.
The average IQ of a young adult with Down syndrome is 50, equivalent to the mental age of an 8- or 9-year-old child, but this number varies widely. [3] At the same time, they enjoy a rich social and emotional awareness. [4] Down syndrome is the most common chromosome abnormality in humans, [3] occurring in about one per 1000 babies born each ...
Cats with the homozygous genotype (MM) die before birth, and stillborn kittens show gross abnormalities of the central nervous system. [3] Cats with the heterozygous genotype (Mm) show severely shortened tail length, ranging from taillessness to a partial, stumpy tail. [3] Some Manx cats die before 12 months old and exhibit skeletal and organ ...
Willy the groom is a handsome black cat with golden eyes, wearing a black tux. ... nearly pulling the set piece down on Willy’s head. ... or wobbly cat syndrome. Mandy, who “had every animal ...
Ehlers-Danlos syndrome is a genetic disorder in humans and animals which can cause connective tissue disorders, hyper mobility, bruising, and a range of other issues. ... In cats it cause limb ...
Sequencing of the agouti signalling peptide in the agouti gene coding region revealed a 2-base pair deletion in black domestic cats. These variants were absent in melanistic individuals of Geoffroy's cat, oncilla, pampas cat and Asian golden cat, suggesting that melanism arose independently at least four times in the cat family. [20]
An 8-year-old boy with Down syndrome became a hero after he alerted his 14-year-old sister of a fire in their Colorado home, helping them get out on time before it was engulfed in flames ...
A black cat resting on a fence. A black cat is a domestic cat with black fur. They may be a specific breed, or a common domestic cat of no particular or mixed breed. Most black cats have golden irises due to their high melanin pigment content. Black cats are the subject of myth, legend, and superstition.