Biology
Chromosomal aberration refers to a change in number of chromosomes, can occur on one, or several, or all of the chromosomes within a nucleus. This is cause by the failure of sister chromatids to separate during anaphase of mitosis or the failure of homologous chromosomes to separate during anaphase I and/or II of mitosis. Aneuploidy refers to the loss or gain of single chromosomes but polyploidy refers to the increase in entire haploid sets of chromosomes. Structural aberrations are the result of chromosomal breaks that occur during meiosis or mitosis. This often leads to reshuffling of alleles on the chromosome. This is often caused by the deletion, duplication, translocation, inversion of several gene loci within chromosomes.
- Recombination Occurs By Physical Exchange Of Dna
KEY TERMS:Crossing-over describes the reciprocal exchange of material between chromosomes that occurs during prophase I of meiosis and is responsible for genetic recombination. A bivalent is the structure containing all four chromatids (two representing...
- Notes On Reproduction
Some key points about mitosis and meiosis.Mitosis· Mitosis is where diploid cells produce more diploid cells. This is how all the cells are reproduced, except, the gametes ( sex cells) · ...
- #32 Summary Of Cell And Nuclear Division
1. Growth of a multicellular organism is a result of parent cells dividing to produce genetically identical daughter cells. 2. During cell division the nucleus divides first, followed by division of the whole cell. 3. Division of a nucleus to produce...
- # 28.1 The Mitotic Cell Cycle - Syllabus 2015
? Replication and division of nuclei and cells ? Understanding of chromosome behaviour in mitosis Learning Outcomes Candidates should be able to: (a) explain the importance of mitosis in the production of genetically identical cells, growth, repair...
- Anaphase
Term: anaphase Literally meaning: ?toward appearance?Origin: Anc Greek???-/ana-(=prefix denoting up to, toward, against) >???/ana(=up, on, upon before, first)?????/phasis(=stage) > ?????/phasko(=imperfect tense of verb ??????/phemi(=appear, show,...
Biology
Chromosomal Aberration
Chromosomal aberration refers to a change in number of chromosomes, can occur on one, or several, or all of the chromosomes within a nucleus. This is cause by the failure of sister chromatids to separate during anaphase of mitosis or the failure of homologous chromosomes to separate during anaphase I and/or II of mitosis. Aneuploidy refers to the loss or gain of single chromosomes but polyploidy refers to the increase in entire haploid sets of chromosomes. Structural aberrations are the result of chromosomal breaks that occur during meiosis or mitosis. This often leads to reshuffling of alleles on the chromosome. This is often caused by the deletion, duplication, translocation, inversion of several gene loci within chromosomes.
- Recombination Occurs By Physical Exchange Of Dna
KEY TERMS:Crossing-over describes the reciprocal exchange of material between chromosomes that occurs during prophase I of meiosis and is responsible for genetic recombination. A bivalent is the structure containing all four chromatids (two representing...
- Notes On Reproduction
Some key points about mitosis and meiosis.Mitosis· Mitosis is where diploid cells produce more diploid cells. This is how all the cells are reproduced, except, the gametes ( sex cells) · ...
- #32 Summary Of Cell And Nuclear Division
1. Growth of a multicellular organism is a result of parent cells dividing to produce genetically identical daughter cells. 2. During cell division the nucleus divides first, followed by division of the whole cell. 3. Division of a nucleus to produce...
- # 28.1 The Mitotic Cell Cycle - Syllabus 2015
? Replication and division of nuclei and cells ? Understanding of chromosome behaviour in mitosis Learning Outcomes Candidates should be able to: (a) explain the importance of mitosis in the production of genetically identical cells, growth, repair...
- Anaphase
Term: anaphase Literally meaning: ?toward appearance?Origin: Anc Greek???-/ana-(=prefix denoting up to, toward, against) >???/ana(=up, on, upon before, first)?????/phasis(=stage) > ?????/phasko(=imperfect tense of verb ??????/phemi(=appear, show,...