Chromosomal Basis Of Heredity Flashcards
(37 cards)
-It is found inside the nucleus
-Contain a very long DNA with thousands of gene.
Chromosomes
Dna and proteins are
Multifolded
-condensed and visible during cell division
-seen to consist of two threads (sister chromatids) joined by a centromere.
-during mitosis the sister chromatids separate and are placed into two nuclei.
Chromosomes
Where the daughter chromatids are bound.
Centromere
Where the microtubules attach during mitosis
Kinetochore
Ends of chromosome
Telomeres
A sequence that is found in the telomeres
TTAGGG sequence
Maintained the TTAGGG sequence in the telomeres
Telomerases
Is important in aging
Telomere shortening
What are the chromosome structures
- metacentric
*submetacentric
*acrocentric
*telocentric
a chromosome whose centromere is centrally located.
Metacentric
a chromosome whose centromere is located near the middle.
Submetacentric
The centromere is present near the end of chromosomes
Acrocentric
a centromere at the end
Telocentric
a specific region of the eukaryotic
chromosome where the kinetochore
(the complex of DNA and proteins
to which the spindle fibers) attach
and pull the chromosomes during
both mitosis and meiosis
Centromere
-Multicellular organisms copy their
chromosomes before cell division.
-They must grow to a mature size.
Interphase
• The nucleus divides, distributing
the chromosomes into two equal
groups.
Mitosis
- The cytoplasm then divides each part taking a nucleus.
Cytokinesis
Breaking off the parent cell into two daughter cells.
Cytoplasmic division
Time frame of the cell cycle
16 hours
Time frame of the Interphase.
15 hours
Timeframe of the M-phase
1 hour
-wrongly considered as a resting stage.
-changes are in molecular levels.
Interphase
- don’t enter cell division
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