Sex Chromosomes
The nuclei of human cells contain 22 autosomes and 2 sex chromosomes. In females, the sex chromosomes are the 2 X chromosomes. Males have one X chromosome and one Y chromosome.
sex chromosomes The chromosomes that determine the sex of an organism. In humans, females have two X chromosomes, and males have one X chromosome and one Y chromosome. Chromosome that determines the gender (sex) of the individual.
sex chromosomes
The pair of chromosomes responsible for determining the sex of an individual.
sex-linked genes ...
Sex chromosomes: The X and Y chromosomes in human beings that determine the sex of an individual. Females have two X chromosomes; males have one X an d one Y. Single strand: One half of a DNA double helix.
Sex Chromosomes
Humans have 23 pairs of chromosomes (46 total) chromosomes. Two of these are called sex chromosomes, the other 44 are called autosomes.
Sex chromosomes are a relatively recent invention. Our ancestors in the tree of evolution did not have two sex chromosomes that are fully differentiated the way we know them with an X and a Y chromosomes.
2 sex chromosomes
60
Normal members of a particular eukaryotic species all have the same number of nuclear chromosomes (see the table). Other eukaryotic chromosomes, i.e.
The sex chromosomes are one of the 23 pairs of human chromosomes. The X chromosome spans more than 153 million base pairs (the building material of DNA) and represents about 5 percent of the total DNA in cells.
Women have sex chromosomes of XX, and men have sex chromosomes of XY.
Which of a women's grandparents could not be the source of any of the genes on either of her X-chromosomes? A. Mother's Father.
B. Father's Mother.
One of the two sex chromosomes, X and Y.
See also: X chromosome, sex chromosome
Yeast artificial chromosome (YAC)
Constructed from yeast DNA, it is a vector used to clone large DNA fragments.
See also: cloning vector, cosmid ...
Genome -- all of the genes carried by a single gamete; the DNA content of an individual, which includes all 44 autosomes, 2 sex chromosomes, and the mitochondrial DNA. Genotype -- genetic constitution of an organism.
Typically in mammals, the gender of an organism is determined by the sex chromosomes. In the case of humans, this happens to be the X and the Y chromosomes. So as you may recall, if you are XX, you are female. If you are XY, you are male.
Sex chromosomes may differ in their size, depending on the species of the organism they are from. In humans and Drosophila, males have a smaller sex chromosome, termed the Y, and a larger one, termed the X.
The sex chromosomes comprise the 23rd chromosome pair in a human karyotype. Compare autosome.
Related Terms:
Chromosome
The term was proposed by Waldeyer (1888) for the individual threads within a cell nucleus (gk. chroma, colour; soma, body).
The diploid human genome consists of 46 chromosomes, 22 pairs of autosomes, and one pair of sex chromosomes (the X and Y chromosomes).
Related Terms:
Chromosome ...
A human cell contains 23 pairs of homologous chromosomes: 22 of them are homologous non-sex chromosomes (or autosomes) and 1 homologous pair of sex chromosomes. In females, the homologous sex chromosomes are 2 X's; in males the X and Y chromosomes.
genes located on the sex chromosomes; usually refers to X-linked genes
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
...
Autosomal dominant A gene on one of the non-sex chromosomes that is always expressed, even if only one copy is present. The chance of passing the gene to offspring is 50% for each pregnancy.
See also: autosome, dominant, gene ...
We have two chromosomes, the X and the Y which are the sex determining chromosomes and are therefore called the sex chromosomes. However, the X and Y chromosomes have genes for traits other than sex.
A sex chromosome is one of the two chromosomes that specify an organism's genetic sex. Humans have two kinds of sex chromosomes, one called X and the other Y. Normal females possess two X-chromosomes and normal males one X and one Y.
A chromosome pair with some homology but differing in size, shape, or staining properties. Homologous chromosome pair which are not morphologically identical (eg the sex chromosomes).
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
 See also: Sex chromosome, Chromosomes, Sex, Chromosome, Human
  
|
RSS
