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variattioon
| Question | Answer |
|---|---|
| Crossing over | the interchange of the parts of the chromatids of the homologus pairs of chromosomes during the 1st stageDuring prophase 1 th chromatides of the homologous chromosomes can tangle together. |
| chiasma | The point at which the chromatids cross over |
| recombination | These overlapping chromatids may exchange segments of their DNA with each other most original but some new - unique combo |
| Independent assortment: | the random combinations of alleles due to allele pairs separating independently of each other During A1, pairs seperate one to each pole.c. All pairs do this independently of each other and randomly |
| Nondisjunction | when one or more of the chromosome pairs fail to separate during meiosis homologous pairs (1) or chromatids (2) |
| no dis resul | gamete: 24 or 22 chromo (after fertilise) zygoote: 47 or 45 This produces unexpected characteristics in offspring, severe defects & sometimes miscarrigees in pregnancy |
| Trisomy | a condition when an individual inheritts an extra copy of a chromosome - e Trisomy 21 which results in altered physical appearance & variable degrees of intellectual disability |
| Monosomy | when an individual has only one copy of a chromosome instead of 2 |
| Partial monosmy | when an individual has part of a chromosome missing |
| Partial trisomy | when an individual has part of an extra chromosome |
Created by:
procrast
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