How to use spermatozoan in a sentence? Find typical usage patterns (collocations)/phrases/context for "spermatozoan" and check conjugation/comparative form for "spermatozoan". Mastering all the usages of "spermatozoan" from sentence examples published by news publications.
The choanocyte then transforms into an amoeba-shaped cell called a carrier cell, which gives up the spermatozoan to an egg, lying near a chamber formed by choanocytes and containing long lashlike appendages called flagella.
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Where the spermatozoan is about to pierce, the yolk (ooplasm) is drawn out into a conical elevation, termed the cone of attraction or reception cone. Once the spermatozoon has entered, the peripheral portion of the yolk changes into a membrane, the perivitelline membrane, which prevents the passage of additional spermatozoa.
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Successful fertilization is enabled by three processes, which also act as controls to ensure species-specificity. The first is that of chemotaxis which directs the movement of the sperm towards the ovum. Secondly there is an adhesive compatibility between the sperm and the egg. With the sperm adhered to the ovum, the third process of acrosomal reaction takes place; the front part of the spermatozoan head is capped by an acrosome which contains digestive enzymes to break down the zona pellucida and allow its entry.
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These most often possess two of each chromosome from the Jefferson salamander and one of each chromosome from the blue-spotted salamander, resulting in an LJJ genotype (also called a Tremblay's salamander.) This genotype results when these polyploid females mate with a pure Jefferson salamander male, incorporating (often in warmer water conditions) the chromosome from the pure male Jefferson salamander into her egg, usually having an LJ diploid chromosome set or LJJ triploid chromosome set, to produce LJJ or LJJJ offspring, respectively. Often in cooler conditions, the LJ or LJJ female may mate with the Jefferson salamander male and only 'borrow' his spermatozoan to trigger genetic cloning of herself, not adding his chromosome (J) to her egg. The same polyploid reproductive strategy occurs for other mole salamander species. The presence of these polyploids makes it difficult to visually identify which species an individual may be, skewing population measures for both species.
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