The X (female) and Y (male) chromosomes. A person with XX is female. A person with XY is male.
X and Y in males
A photograph of the chromosomes in a cell is known as a karyotype. The autosomes are numbered 1-22 in decreasing size order.
Nondisjunction
It is called a karyotype. If it shows two X chromosomes, the person is a female; if it shows one X and one Y chromosome, the person is a male.
During Metaphase 1 the homologous pairs of chromosomes line up at the center of the cell. They arrange around the spindle during meiosis.
Centrioles
A photograph of the chromosomes in a cell is known as a karyotype. The autosomes are numbered 1-22 in decreasing size order.
homologous chromosomes
Nondisjunction
This process is called crossing over.
metaphase I of meiosis
Meiosis
It is called a karyotype. If it shows two X chromosomes, the person is a female; if it shows one X and one Y chromosome, the person is a male.
During Metaphase 1 the homologous pairs of chromosomes line up at the center of the cell. They arrange around the spindle during meiosis.
Centrioles
Homologous chromosomes are chromosome pairs of the same length, centromere position, and staining pattern, with genes for the same characteristics at corresponding loci. One homologous chromosome is inherited from the organism's mother; the other from the organism's father.[1]
It's also called "general recombination".Sometimes homologous recombination is mistakenly called "crossover", but crossover is a result of homologous recombination and not really synonymous.
homologous