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The winter coat is unusually long and uniform for an animal its size, with a luxuriant mane of tough, long hairs along the back from the occiput to the base of the tail. The coat is generally coarse and bristly, though this varies according to season. In winter, the coat is fairly dense, soft, and has well-developed underfur.
Hyenas or hyaenas (/ h aɪ ˈ iː n ə z / hi-EE-nəz; from Ancient Greek ὕαινα, hýaina) [1] are feliform carnivoran mammals belonging to the family Hyaenidae (/ h aɪ ˈ ɛ n ɪ d iː /). With just four extant species (each in its own genus), it is the fifth-smallest family in the order Carnivora and one of the smallest in the class ...
Chasmaporthetes was one of the so-called "dog-like" hyenas (of which the aardwolf is the only survivor), a hyaenid group which, in contrast to the now more common "bone-crushing" hyenas, evolved into slender-limbed, cursorial hunters like modern canids.
Modifier genes can alter the expression of other genes in either an additive or multiplicative way. [3] Meaning the phenotype that is observed can be a result of two different alleles (gene variants) being summed or multiplied. However, a reduction in expression may also occur in which the primary locus, where the gene is located, is affected. [4]
A gene signature or gene expression signature is a single or combined group of genes in a cell with a uniquely characteristic pattern of gene expression [1] that occurs as a result of an altered or unaltered biological process or pathogenic medical condition. [2] This is not to be confused with the concept of gene expression profiling.
Pachycrocuta is an extinct genus of prehistoric hyenas.The largest and most well-researched species is Pachycrocuta brevirostris, colloquially known as the giant short-faced hyena as it stood about 90–100 cm (35–39 in) at the shoulder [1] and it is estimated to have averaged 110 kg (240 lb) in weight, [2] approaching the size of a lioness, making it the largest known hyena.
Environmental epigenetics is a branch of epigenetics that studies the influence of external environmental factors on the gene expression of a developing embryo. [1] The way that genes are expressed may be passed down from parent to offspring through epigenetic modifications, although environmental influences do not alter the genome itself.
The Tsix RNA is transcribed antisense to Xist, meaning that the Tsix gene overlaps the Xist gene and is transcribed on the opposite strand of DNA from the Xist gene. [28] Tsix is a negative regulator of Xist; X chromosomes lacking Tsix expression (and thus having high levels of Xist transcription) are inactivated much more frequently than ...