Question

what is one characteristic of our genomes that suggests that primates and humans share a common ancestor?

what are the components of semen?

Answer 1

Ans 1-Human DNA is, on average, 96% identical to the DNA of our most distant primate relatives, and nearly 99% identical to our closest relatives, chimpanzees and bonobos. This similarity of genome shows that primates and humans share a common ancestor.

Ans 2- Composition of semen-

Semen is a greyish white bodily fluid that is secreted by the gonads of male animals. It carries sperm or the spermatozoa and fructose and other enzymes that help the sperm to survive to facilitate successful fertilization. Semen also contains other liquids, known as seminal plasma, which help to keep the sperm cells viable.

The whitish opalescence is due to the large amount of protein that it contains and its slightly turbid appearance is due to the spermatozoa contained within it.

Structures within the male reproductive tract that are involved in the production of semen include:

• Testes and epididymis- 5 per cent of semen is produced from the testicles and epididymis
• Prostate- 13 to 33 per cent by the prostate gland
• Seminal vesicles- 46 to 80 per cent of the fluid is produced by the seminal vesicles
• Bulbourethral gland- 2-5 percent from Bulbourethral and urethral glands

Composition

Semen contains 10% sperms and 90% of fluid part, which is called seminal plasm

Semen contains citric acid, free amino acids, fructose, enzymes, phosphorylcholine, prostaglandin, potassium, and zinc.

SPECIFIC COMPONENTS OF SEMEN

Gland/Site	Features
Testis/Epididymis	Average approximately spermatozoa 80 million/ml
Seminal Vesicle	Fructose (1.5-6.5 mg/ml) phosphorylcholine ergothioneine, ascorbic acid, flavins prostaglandins, bicarbonate
Prostate	prostate, spermine, citric acid, cholesterol,phospholipids,Fibrinolysin, fibrinogenase, zinc acid, phosphatease, prostate-specific
Bulbourethral Glands	Clear mucus