2020年10月26日 · Some people have differing sex chromosomes, such as those who are born with an extra X chromosome (XXY) or who are missing an X chromosome (XO). Or, some people with XX or XY chromosomes might have physical characteristics that don’t seem to align with what’s typically expected of their DNA.

人类的性别决定方式为XX-XY型，男性为异型性染色体，细胞中含一条X染色体，另一条是Y染色体，其性染色体组成为XY；而女性为同型性染色体，其性染色体组成为XX，体细胞中含有两条X染色体。 在配子发生时，男性可以产生2种精子，含有X染色体的X型精子和含有Y染色体的Y型精子，两种精子的数目均等；而女性只能形成1种含有X染色体的卵子。 受精时，X型精子与卵子结合，形成性染色体组成为XX的受精卵，将来发育成为女性；而Y型精子与卵子结合则形成性染色 …

XX/XY: Directed by Austin Chick. With Mark Ruffalo, Maya Stange, Kathleen Robertson, Kel O'Neill. Three friends begin a dangerous three-way relationship that spirals out of control, leading to dire consequences that haunt them ten years later.

PCR analysis was performed on a variety of genomic DNA samples isolated from fetal sheep skeletal muscle, brain, liver, and placenta, and revealed a single 259 bp band for MYOG in XX females, and a 259 bp band for MYOG and a 167 bp band for SRY in XY males.

Females have a pair of X chromosomes (46, XX), whereas males have one X and one Y chromosomes (46, XY). Chromosomes are made of DNA, and genes are special units of chromosomal DNA. Each chromosome is a very long molecule, so it needs to be wrapped tightly around proteins for efficient packaging.

在生殖细胞（generative cell）中，男性生殖细胞染色体的组成：22号常染色体+X/Y。 女性生殖细胞染色体的组成：22号染色体+X。 根据着丝粒的位置不同，把人类染色体分为三种类型：①中央着丝粒染色体（metacentric hrmosome），着丝粒位于染色体纵轴的1/2~5/8处；②亚中着丝粒染色体（submetacentric chromosome），着丝粒位于染色体纵轴的5/8~7/8处；③近端着丝粒染色体（acrocentric chromosome），着丝粒位于染色体纵轴的7/8至末端。 染色体分组、核型与显带 …

2024年8月12日 · We show that weeping willow arose from crosses between a female ancestor from the Salix-clade, which has XY sex chromosomes on chromosome 7, and a male ancestor from the Vetrix-clade, which has...

JAX uses a very high speed Taq (~1000 bp/sec), use cycling times recommended for your reagents.

2020年8月2日 · Here we report on a simple multiplex PCR assay to distinguish XX and XY tissues in sheep via amplification of multiple targets in a single reaction. Specifically, PCR was used to amplify an autosomal MYOG gene fragment present in both XX and XY tissues, and a fragment of the SRY gene present only in XY tissues. This PCR assay will be of great ...

在男性中，性染色体为 xy，即一条 x 染色体和一条 y 染色体。 X 染色体携带了许多与女性性别发育有关的基因，而 Y 染色体则携带了决定男性性别的基因。