. The elements of genetics. Genetics. Fig. 19.—Meiosis in the egg of the horse thread worm Ascaris megalocephala, a race with two diploid chromosomes. Left: the normal series ending in fusion of single egg and sperm chromosomes. Right: the result of a misorientated first division spindle is the failure of expulsion of the first polar body which fuses with its sister nucleus. The second division leaves a diploid egg which is fertilized to give a triploid embryo. Fusion with a similarly exceptional diploid sperm would give a tetraploid of the race which is indeed found in nature (after Boveri, 1
. The elements of genetics. Genetics. Fig. 19.—Meiosis in the egg of the horse thread worm Ascaris megalocephala, a race with two diploid chromosomes. Left: the normal series ending in fusion of single egg and sperm chromosomes. Right: the result of a misorientated first division spindle is the failure of expulsion of the first polar body which fuses with its sister nucleus. The second division leaves a diploid egg which is fertilized to give a triploid embryo. Fusion with a similarly exceptional diploid sperm would give a tetraploid of the race which is indeed found in nature (after Boveri, 1904). EUmenli of (j::i!<:ik!i 97. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darlington, C. D. (Cyril Dean), 1903-; Mather, Kenneth. New York : Macmillan
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