Word: spermatozoa
(lookup in dictionary)
(lookup stats)
Dates: during 1923-1923
Sort By: most recent first
(reverse)
...Columbia, rests on strictly objective data. They say there is a special chromosome (chromosomes are minute bodies of constant number and appearance for each species of plant or animal which 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...