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"The first inkling that sex chromosomes were unique from all other chromosomes came from experiments conducted by German biologist Hermann Henking in 1891… Henking saw that some wasp sperm cells had 12 chromosomes, while others had only 11. Moreover, while observing the stages of meiosis that formed these sperm cells, Henking noticed that the mysterious twelfth chromosome looked different from all the others. He thus named this chromosome the "X element," to represent its unknown nature.
The Y chromosome was identified as a sex-determining chromosome by Nettie Stevens … during a study of the mealworm Tenebrio molitor … Stevens proposed that chromosomes always existed in pairs and that the Y chromosome was the pair of the X chromosome discovered in 1890 by Hermann Henking … Stevens named the chromosome "Y" simply to follow on from Henking's "X" alphabetically."
I like how my college biology class costs somewhere in the ballpark of hundreds of dollars, I go to every single class, read the textbooks, review my lecture notes, and pay attention, but still don't pick up on topics like this. I come to this 6 minute video, learn for free, and have the topic down instantly...
Yes. Since it is a sex linked trait and attached to the X-chromosome, the male offspring can have hemophilia if the mother is a carrier and and passes that hemophilia X onto her son. A male will always get his X chromosome from his mother, along with any associated traits. Hope that helped.
I believe inheritance is complete dominance. When you are homozygous or heterozygous dominant for the trait, only the dominant allele is expressed in both cases and you won't have hemophila. It is only when you are homozygous recessive that you will have hemophilia. Hope it helps!
Why not follow the custom of Capitals for labeling Dominant? Capital N for Normal, little n for color-blindness, or hemophilia, or muscular dystrophy? Using Capital H for NOT hemophilia is unnecessarily confusing...Big Fan, btw!
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