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Spermatocytes are a type of male gametocyte in animals. They derive from immature germ cells called spermatogonia. They are found in the testis, in a structure known as the seminiferous tubules. There are two types of spermatocytes, primary and secondary spermatocytes . ...
In 1881, Charles Darwin and his son Francis performed experiments on coleoptiles, the sheaths enclosing young leaves in germinating grass seedlings. The experiment exposed the coleoptile to light from a unidirectional source and observed that they bend towards the light. By covering various parts of the coleoptiles with a light impermeable opaque cap, the Darwins discovered that light is detected ...
The endometrium is the innermost glandular layer and functions as a lining for the uterus, preventing adhesions between the opposed walls of the myometrium, thereby maintaining the patency of the uterine cavity. During the menstrual cycle or estrous cycle, the endometrium grows to a thick, blood vessel-rich, glandular tissue layer. ...
Seedlessness is seen as a desirable trait in edible fruit with hard seeds such as banana, pineapple, orange and grapefruit. Parthenocarpy is also desirable in fruit crops that may be difficult to pollinate or fertilize, such as fig, tomato and summer squash. In dioecious species, such as persimmon, parthenocarpy increases fruit production because staminate trees do not need to be ...
It is activated by follicle-stimulating hormone (FSH) secreted by the adenohypophysis and has FSH-receptor on its membranes. It is specifically located in the convoluted seminiferous tubules (since this is the only place in the testes where the spermatozoa are produced). Development of Sertoli cells is directed by the testis-determining factor protein. ...
Male sex hormones are secreted by the testes later in embryonic life to cause the development of secondary sex organs. The scrotum is developmentally homologous to the labia minora and labia majora. The raphe does not exist in females. Reproductive organs and tissues develop in females and males begin during the fifth week after fertilization. ...
Phytochromes exist in two interconvertible forms PR because it absorbs red (R; 660 nm) light; PFR because it absorbs far-red (FR; 730 nm) light. ...
Menopause, also known as the climacteric, is the time in most women's lives when menstrual periods stop permanently, and they are no longer able to bear children.Menopause typically occurs between 49 and 52 years of age Medical professionals often define menopause as having occurred when a woman has not had any vaginal bleeding for a year It may also be ...
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