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Head - Structure of the Sperm
It exhibits a diversity of shapes in different animal groups, e.g., spherical (teleost fishes), rod or lance shaped (amphibians), spirally twisted like a corkscrew (birds), spoon shaped (man), flattened (buffalo) or hooked (mouse and rat) or occasionally round (bivalve molluscs). Some of these shapes may be interpreted as an adaptation to propulsion in fluid media. The genetic functions are embodied in the nucleus; activation of egg during fertilization is basically initiated by anterior cap like acrosome. The nucleus occupies the greater part of head and it also determines the shape of head. During the course of sperm differentiation (spermiogenesis), everything in the nucleus not directly concerned with the transmission of heredity characters is discarded leaving only the actual material of genes (DNA) which is tightly packed within the nucleus.
Briefly Describe about Development of Sexual Maturity in Children? Sexual maturity develops along with growth spurt in adolescence. In girls, growth stops on attaining menarche
Composite Endosperm - Variants of Endosperm In the family Loranthaceae, the development of endosperm is unique. The ovary lacks ovules. The sporogenous tissue located at the b
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How is digestion performed in protozoans? Digestion in protozoans is intracellular digestion: organic material is internalized and degraded inside the cell. Protozoans get
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how does respiration in animals occur? what is respiration? what are the common types of respiration?
he heartbeat begins with the depolarization of the
commercially important bivalve species
Explain chemical bonds in basic chemistry? Chemical Bonds : Chemical bonds are forces that join atoms together in a functional unit. There are three types of bonds that can
Q. Why do diabetic patients often undergo dietary sugar restriction? What are the major complications of diabetes mellitus? Diabetic patients are frequently advised to ingest f
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