2007-02-16 18:29:57 · 13 answers · asked by asianmr2 1 in Science & Mathematics ➔ Biology
human chromosomes have 23 pairs.
A. Structure of a chromosome (Typical metaphase chromosome)
A chromosome is formed from a single DNA molecule that contains many genes. A chromosomal DNA molecule contains three specific nucleotide sequences which are required for replication: a DNA replication origin; a centromere to attach the DNA to the mitotic spindle.; a telomere located at each end of the linear chromosome.
The DNA molecule is highly condensed. The human DNA helix occupy too much space in the cell. Small proteins are responsible for packing the DNA into units called nucleosomes.
B. Stained chromosomes:
Chromosomes are stained with A-T (G bands) and G-C (R bands) base pair specific dyes.
When they are stained, the mitotic chromosomes have a banded structure that unambiguously identifies each chromosome of a karyotype. Each band contains millions of DNA nucleotide pairs which do not correspond to any functional structure.
C. Karyotype of a male:
The human haploid genome contains 3,000,000,000 DNA nucleotide pairs, divided among twenty two (22) pairs of autosomes and one pair of sex chromosomes.
2007-02-16 18:55:36 · answer #1 · answered by msjerge 7 · 0⤊ 0⤋
46 including the sex chromosomes. They occur as 23 pairs. The last pair is the sex chromosomes and this is where the X and Y chromosome occurs. Generally people think all chromosomes are X and Y but they are not.
2007-02-18 07:54:17 · answer #2 · answered by chunky1990 3 · 0⤊ 0⤋
We have a total of 46 chromosomes or 23 pair. We get half from our father and half from our mother. Consequently, the reproductive cells (eggs and sperm) only have one of each pair (23 total instead of 46) so that we pass along half of our info to our children. Of these pairs, 22 are called autosomes and 1 is the sex chromosomes. The chromosomes are basically the "house" for the DNA info and its necessary proteins.
2007-02-18 11:11:37 · answer #3 · answered by samsona 3 · 0⤊ 0⤋
humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females. Females have two copies of the X chromosome, while males have one X and one Y chromosome.
2007-02-16 18:38:26 · answer #4 · answered by ♥!BabyDoLL!♥ 5 · 1⤊ 0⤋
46 total chromosomes
2007-02-16 20:44:08 · answer #5 · answered by Anonymous · 0⤊ 0⤋
23 pairs including 1 pair of sex chrosome . of these chromosomes each pair regulates a single character.XX is the female sex chromosome and XY is the male.
2007-02-16 22:03:11 · answer #6 · answered by jasmine 2 · 0⤊ 0⤋
24 pairs of chromosomes
2007-02-16 20:15:10 · answer #7 · answered by peach blossom 1 · 0⤊ 2⤋
23 pairs notice that 1 pair is sex chromosomes.
2007-02-16 19:10:13 · answer #8 · answered by Anonymous · 0⤊ 0⤋
He could have had 40 six. He replaced into completely human. Christians are all gonna disagree on how Jesus have been given the different 23 chromosomes. some have confidence God is human-like and that people are made "in the image and likeness of God" (Genesis a million:27). Others will have confidence that God in simple terms made Jesus have 40 six chromosomes in simple terms to make Jesus completely finished.
2016-12-17 12:00:58 · answer #9 · answered by Anonymous · 0⤊ 0⤋
23 pairs including one pair of sex chromosomes.
2007-02-16 18:35:02 · answer #10 · answered by J.SWAMY I ఇ జ స్వామి 7 · 0⤊ 1⤋