1)can you think of reasons why more complex organisms cannot give rise to new individual through regeneration ?
2) why is DNA copying an essential part of the process of reproduction ?
3)how does the embryo get nourishment inside the mother's body ?
4)what is the role of the seminal vesicles and the prostate gland ?
Answers
Answer:
1 ANSWER'Complex multicellular organisms cannot give rise to new organism because the tissue and specialised cell make up the organs in the body. ... Organisms at higher complex levels cannot give rise to new individuals through regeneration because they have organization of their organs system at different levels.
2;DNA copying is an essential part of the reproduction process because an organism's entire genetic information is contained within the DNA. If the DNA mutates, then there is a chance that the resulting organism may be born with a deformity or other genetic abnormality.
3.Embryo derives its nourishment from the mother's blood through the placenta. Placenta contains villi on the side of the embryo and blood vessels surrounding villi on the side of the mother. Oxygen and glucose pass from the mother to the embryo through the placenta.
4.Seminal Vesicles
The seminal vesicle is the accessory gland in human males whose secretion activates the sperms.
It is also called the uterus masculine.
There is only one pair of Seminal vesicles in man.
It consists of fructose, ascorbic acid, prostaglandin and enzymes.
The fructose functions by providing energy.
The secretions of the seminal vesicles are alkaline, slimy and its pH is about 7.4.
Prostate gland
A bilobed structure which surrounds the urethra close to its origin from the bladder. It pours an alkaline secretion into the semen as it passes through the urethra.
It is situated around the anterior end of the urethra.
The prostate gland secretes a white fluid, which forms 25 to 30 per cent of semen.
The fluid contains Phosphate, lysozymes, spermin, citrate, fibrinolysin, etc.
Its secretions activate the sperms and prevent the semen from coagulating.
In aged men, the size of the prostate may be enlarged which creates a problem during urine discharge.
The prostate gland consists of four main lobes: 1 – Ventral lobe, 1 – Dorsal lobe and 2- lateral lobes.
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