By Laura Gould
The Vets flip faded. . . George, a male calico, used to be a genetic anomaly, a manifestation of whatever that may not purported to take place, a creature so infrequent that even such a lot veterinarians have by no means noticeable one. His curious lifestyles sparked Laura Gould's lengthy seek throughout the information of genetics to unearth the captivating and valiant roles performed by means of early cat geneticists, in addition to cats themselves, within the learn of genes and the way they paintings. for everybody with an curiosity in cats and cat breeding, this is often an unforgettable and infrequently hilarious account of the intersecting lives of cats and geneticists.
the sector of genetics has exploded considering that 1992, whilst the 1st version of Cats should not Peas was once accomplished. therefore a long Addendum is integrated during this re-creation, supplying the reader with the terminology and ideas had to comprehend burgeoning new parts within which cats have back had major roles to play---the sequencing of genomes and the construction of clones. those descriptions let you view with expanding ask yourself the realm round you and to imagine heavily approximately no matter if you desire to have your individual genome mapped or your cat cloned, either one of that are now attainable (if you could have the funds for it).
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Extra resources for Cats Are Not Peas: A Calico History of Genetics, Second Edition
By the time a female embryo has completed three months of fetal development, her germ cells have already entered the initial phases of meiosis; at birth they will number about two million. These germ cells will remain in their arrested state until the child-bearing years arrive. Then hormones will cause only a few hundred of them to resume their meiotic progression. Every month one of these will be ovulated, just after it completes its first meiotic division. Where eggs are concerned, the two cells that result from this division are dramatically diﬀerent in size from one another (rather than the same, as symbolized for sperm in Figure 5).
I had also come upon an evolutionary theory about what had caused the Y to shrink (apparently, like all the other chromosomes, it used to be the same size as its friend the X). This fit in well with a theory in another book suggesting that all mammals are basically female and that the sole function of the Y is to override this predilection. I was starting to believe that I might be able to manage both the geographical and the intellectual distances involved. I was hot on the trail of many foxes.
How Do You Get a George? 25 Figure 4. Making two identical cells by mitosis (only two chromosome pairs shown). 26 Cats Are Not Peas Meiosis Meiosis in mammals is the process by which sex cells are generated. It’s used exclusively by special cells of the gonads called germ cells that have been entrusted with the task of converting themselves into either eggs or sperm. These resulting sex cells are responsible for the propagation of the species and are fundamentally diﬀerent from all other cells of the body.