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There are two important terms to note: Sister chromatids Homologous chromosomes. Sister chromatids are visible during most phases of mitosis, but not rest of cell cycle. colchasine is an inhibitor of micro tubules so it prevents the chromosomes from 'liming up" during metaphase hence it arrests at metaphase and the chromosomes are scattered all Over ...


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Lizards of the genus Uta are apparently male heterogametic (XY) (Pennock et al. 1969). The XY system seems to be the most common mode of sex determination in iguanid lizards (Kasahara et al. 1983). Kasahara, Y et al. 1983. Chromosome mechanisms of sex determination, G- and C-band patterns and nucleolus organizer regions in Tropidurus torquatus (Sauria, ...


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There are many different ways a DNA sequence can change. Labeling a change as a mutation implies that there was a biological process in which DNA was damaged then not properly repaired. Crossing over during the formation of gametes does not result in a mutation. Crossing over during repair of a double stranded DNA break does result in a mutation.


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Yes. And it is especially considered a large-scale mutation when compared to point mutations which effect single bases.


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Based on answers and discussion so far and my own searches, I think there is no widely understood and used term for grouping the X/Z and W/Y chromosomes. You could coin your own term or pluck one from obscurity in the literature, however, I think you would probably be better off not doing so and simply writing X/Z and W/Y wherever you need to refer to the ...


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I just tried a search of major and minor sex chromosomes and found a paper here by Judith Mank who refers to the X and Z as the Major Sex Chromosomes and Y and W as the Minor Sex Chromosomes. I will therefore refer to the W and Y as minor sex chromosomes, and will use the term major sex chromosomes in reference to the X and Z. These terms are based ...


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Regarding the meio/majo or micro/macro suggestion, I do not think it is the way to go for the following reasons: Micro and macro-chromosomes are terms already used in species such as chicken whose genomes combine very small and big chromosomes Although this is more the exception than the rule, bear in mind that sometimes the Y chromosome is bigger than the ...


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I think you can safely use the terms heterogametic (Y/W) and homogametic (X/Z) chromosomes, meaning that a heterogametic chromosome is the chromosome which makes one of the sexes heterogametic (i.e. defines the difference between the two types of gametes of the respective sex). These terms applied to chomosomes do have some usage in the literature, e.g. in ...


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"Monosomy for the X chromosome in humans creates a genetic Achilles' heel for nature to deal with." The article I quoted1 tackles this issue. It's from the turn of the century, though, so quite old in sequencing/genetic terms, but the science is still sound as far as I can tell. Here's the money quote: Hence, the X chromosome appears to have a lower ...



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