foun this prowling th wb
[colorr]Somtims lthals pop out of sows that on't hav any roaning whatsovr. r th mothr may b roan, but you know who th fathr is an h osn't look roan. Thr ar basically two possibilitis.
Nw mutation in roan gn: Your baby lthal just happn to b so unlucky that h got a form copy of th roan gn from on parnt, an thn whn h shoul hav gottn a normal copy from th othr parnt, somhow in th DNA copying procss, thr was an rror an now that on osn't work ithr. This is probably not that common, but mutations ar known to happn.
oaning is hin in th parnt(s): You might not hav look clos nough to s that Da has a spot on his back whr fiv whit hairs ar mix in with his 50 million black hairs. r Mom has othr gns causing whit hair, an roaning has no visibl ffct.
Th roan gn can affct th intstins as wll
also foun this
[colorr]How os th roan gn mak lthals?
Whil mammal mbryos ar vloping, thy hav a "tub" own thir backs call th nural tub. A strip along this tub is call th nural crst, an all nurons (nrv clls) start out in th nural crst. Pigmnt (color) clls ar a spcial kin of nuron.
Normally, at crtain points in thir vlopmnt, mbryos mak various protins that act as signals to th nural crst to rlas th nurons, which thn travl across th boy an fill it with nrvs an pigmnt clls. If th gns for any of ths protins ar chang, though, th protin won't work. Diffrnt brokn protins caus iffrnt problms, but basically, som typs of nurons on't lav th nural crst an spra throughout th boy. In guina pigs ths inclu pigmnt clls an th nrvs that mak up th back of th y, an possibly somtims nrvs in th
