Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
25 Cards in this Set
- Front
- Back
How many chromosomes in a human body
|
24
|
|
where are chromosome located?
|
in the nucleus
|
|
what does chromosomes contain?
|
Long linear DNA strands along which genes are aligned.
|
|
what happens to chromsomes during the cell cycle?
|
They are duplicated
|
|
What happens in a diploid organism?
|
each chromosome occurs in two copies. Humans are an example
|
|
How many chromosomes in a human body
|
24 different chromosomes
|
|
where are chromosome located?
|
in the nucleus
|
|
what does chromosomes contain?
|
Long linear DNA strands along which genes are aligned.
|
|
what happens to chromsomes during the cell cycle?
|
They are duplicated
|
|
What happens in a diploid organism?
|
each chromosome occurs in two copies. Humans are an example
|
|
What consists of the 24 chromosomes in a human?
|
22 autosomes, and two sex chromosomes
|
|
How many genes does a human genome contain?
|
30,000 genes
|
|
what is a diploid cell?
|
A cell that contains two sets of chromosomes
|
|
definition of mitosis
|
The process where a single cell divides into two identical cells containing the same number of chromosomes and genetic content as that of the original cell
|
|
what is a haploid cell ?
|
one set of chromosomes
|
|
What happens in Interphase mitosis?
|
Chromosomes are uncondensed, and active. Three subphases
1. G1. Cell growth 2. S phase: duplication of DNA, forming sister chromatids within each chromosome 3. G2: preceding next phase in mitosis |
|
What happens in Prophase mitosis?
|
Condensation of the chromosomes.
Also, each chromosome now consists of two sister chromatides connecting at the centromer. The nuclear envelope disappears. |
|
What happens in metaphase mitosis?
|
Chromsomes align at cell equator, connected to microtubules forming the spindle apparatus that stretched from on cell pole to the other.
|
|
what happens in anaphase mitosis?
|
centromeres split and sister chromatides are pulled to opposite poles of the cell.
|
|
What happens in telophase mitosis?
|
Chromosomes decondense. Nuclear membranes assmable. and Cytokinesis starts
|
|
Cytokinesis
|
Its the division of the cytoplasm, giving rise to two daughter cells with identical sets of chromosomes. Daughter cells enter next interphase
|
|
How do plant cells divide?
|
Plant cells divide forming a cell plate between the daughter nuclei
|
|
how do animal cells divide?
|
Animal cells divide forming a cleavage furrow.
|
|
What are the building blocks of DNA?
|
Nucleotides have three conponents
1.Five- carbon sugar 2. phosphate group 3. nitrogen- containg base |
|
What are the four nitrogenous bases in DNA?
|
Adenine
Thymine Guanine Cytosine A&T G&C |