Word: ova
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Dates: during 1923-1923
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...appear in the cells during cell-division) called the X-or accessory chromosome, which is found in half the spermatozoa of male animals. This is present in addition to the regular number of chromosomes, which always occur in pairs (48 in man), thus giving rise to an uneven number. Ova, on the other hand, in variably have two X-chromosomes. Eggs fertilized by spermatozoa con taining the X-element (thus giving the product a double dose of X's) become females, and the others, males. All experimentalists agree that sex is determined at the very beginning of development...