Khi tim hieu kich co bo gene cua 31 loai khung long
va chim da tuyet chung, cac nha nghien cuu tim thay nhung loai an thit nhu T-rex
co bo gene tuong doi nho.
Song, bo gene nho khong ngu y chung la nhung
dong vat thap kem. Chang han, mot con ca lungfish (nhom ca vua co phoi va mang)
co bo gene lon hon ca con nguoi.
 |
| (Anh: abc.net.au) |
Cac nha nghien cuu tai Dai hoc Harvard va Dai hoc Reading o Anh nghien cuu cac
te bao tu nhung xuong hoa thach de ngoai suy kich co bo gene cua chung. Ho da mo
ta nhung khac biet co ban giua cac dong khung long lon. Loai khung long an thit
hai chan con duoc goi la theropods (chang han khung long bao chua, khung long
Allosaurus va Deinonychus) co bo gene rat nho, tuong duong voi cac loai chim
hien dai.
Dieu nay cung dung voi nhung loai chim tuyet chung duoc nghien cuu, trong do co
loai chim bien Hesperornis song cung thoi khung long, va loai lon hon, an thit
va khong biet bay Diatryma, song sot sau khi khung long tuyet diet.
"Ro rang la tat ca nhom theropod, trong do co chim, da duy tri rat lau kich
co han che cua bo gene", truong nhom nghien cuu Chris Organ, noi.
Song, nhung loai khung long an co lai co bo
gene vua phai, cung hang voi than lan va ca sau ngay nay.
Nhom nghien cuu khong tim hieu bo gene cua
nhung loai khung long an co co dai khong lo, con duoc goi la sauropod.
Theo Reuters, VnexpressArticle source http://w4rum.com/883.t
| 