常見(jiàn)例句Mammals normally have two sex chromosomes. 哺乳動(dòng)物正常情況下有兩種性染色體。But unlike humans, the X and Y are not sex chromosomes. 但是與人類(lèi)不同的是,其X與Y染色體卻不是性染色體。Homogametic sex The sex with homologous sex chromosomes, in mammals, designated XX. 同配性別:指有相同性染色體的性別,在哺乳動(dòng)物中,它用XX來(lái)表示。Humans have 22 chromosome pairs plus two sex chromosomes. 除了兩個(gè)性染色體之外,人體有22對(duì)染色體。From the cytogenetic perspective, only a small proportion of fish species have heteromorphic sex chromosomes. 幾十年的細(xì)胞遺傳學(xué)研究表明,魚(yú)類(lèi)性別決定幾乎包括了動(dòng)物的所有性染色體類(lèi)型。Karyotype reveal that in most cells all but sex chromosomes are present as two copies, referred to as homologous pairs. 除了性染色體外,大多數(shù)細(xì)胞的染色體組成對(duì)出現(xiàn),稱(chēng)同源染色體對(duì)。 返回 sex chromosomes