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Updated: May 31, 2025
Again, there are cases in which one sex-chromosome, say X, is double, triple, or even quadruple, while the other, say Y, is single. On fertilisation half the zygotes have XX and half XY, whether Y is absence of a sex-chromosome, or one of the other Y forms above mentioned.
A. Normal horizontal position of the strata, a, b, c, d; xy, horizontal line. B. Folding due to a shortening of the horizontal xy by lateral pressure, acting in the direction of the arrow and due to shrinkage. Immense time has been taken in the process.
Familiarly they were known as the "Nor'-Westers." Shortly before the beginning of the century mentioned, a split took place among the "Nor'-Westers," and as the bales of merchandise of the old Company had upon them the initials "N.W.," the new Company, as it was called, marked their packages "XY," these being the following letters of the alphabet.
In the afternoon I went, with Sergeant Baldwin, to reconnoitre the trench on the right of the main road between Vlamertinghe and Ypres, where we are to spend 'XY night'! It was a very hot day. I got back at 4 p.m.... I wrote two or three letters and then had dinner. To bed at 9.30. At 10.15 a zeppelin came over and dropped a big bomb a few hundred yards away, causing a loud explosion.
'XY night' was the night of July 29-30. We got a little sleep during the morning.
FEMALE x MALE XY XX | \/ | | /\ | XX YX MALE FEMALE The male characters in the male, XX, would appear because present in two chromosomes, but would be recessive in the female because present only in one chromosome.
The fertilisations are thus XX which develops into a female fly, and XY which develops into a male. Drosophila therefore is an example of one of the cases described by Wilson. Dr. He remarks that the X chromosome must be a male-determining factor since in many cases it is the only sex-chromosome in the males, yet its introduction into the egg establishes the female condition.
One day my algebra paper was even worse than usual. With the best intentions in the world to master this intricate branch of knowledge, algebra conveyed nothing whatever to my brain. To state that A + b = xy, seemed to me the assertion of a palpable and self-evident falsehood. After looking through my paper, Tosher called me up. "Your algebra is quite hopeless, Hamilton.
If one of these in reduction expelled a Y chromosome, the other an X, then one would retain an X and the other a Y. Each was fertilised by a sperm, one becoming therefore XX or male and the other XY or female. It may be supposed that as there was only the cytoplasm of one ovum, each nucleus would determine the characters of half the individual developed.
And, in accordance with the above plans, we left Watou on the night of July 25 and marched to Query Camp, near Brandhoek, but on the left of the main road. Here we remained awaiting 'XY night. 'Z day' was the day on which the battle was to take place. On 'XY night' we left Query Camp and took up our positions in our concentration trenches near Vlamertinghe.
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