Biology with Saqib

جھمکا بیل

https://www.facebook.com/share/14J6WFHQhdJ/

The Reader Academy READ TO RISE

Tail of phospholipid has which type of fatty acids
a) saturated
b) unsaturated c) both
d) none

Which one is not a lipid
a) wax b) steroids
c) cutin d) none

An acid and alcohol react to form
a) glycerol b) ester
c) dipeptide
d) phosphodiester bond

Lipids are which type of compounds
a) polar b) non polar
c) ionic d) none

Evolution 🧬 is yet on its way:
The human Y chromosome, which determines male s*x, is slowly disappearing.

Experts say this potentially spells extinction for humans unless a new s*x-determining gene evolves.

But there's hope, as some rodents have already lost their Y chromosomes and found alternative ways to survive.

The Y chromosome contains the SRY gene, which initiates male development in human embryos. However, over millions of years, the Y has been shedding genes. If this trend continues, the last of its remaining 55 genes could vanish in 11 million years.

Rodents like mole voles in Eastern Europe and spiny rats in Japan have lost their Y chromosomes entirely, yet they continue to reproduce. In spiny rats, researchers identified a new s*x-determining gene near SOX9 on chromosome 3, which appears to have replaced SRY.

This discovery provides optimism that humans could also evolve a new s*x-determining gene. However, this evolutionary process comes with risks. If different s*x-determining systems evolve in separate populations, it could lead to reproductive isolation and the emergence of new human species.

In 11 million years, visitors to Earth might find no humans at all — or a world inhabited by multiple human species, each with its own unique way of determining s*x
Lecturer Biology: Saqib Ali

https://www.facebook.com/share/1D4vv3rvPD/

Evolution 🧬 is yet on its way:
The human Y chromosome, which determines male s*x, is slowly disappearing.

Experts say this potentially spells extinction for humans unless a new s*x-determining gene evolves.

But there's hope, as some rodents have already lost their Y chromosomes and found alternative ways to survive.

The Y chromosome contains the SRY gene, which initiates male development in human embryos. However, over millions of years, the Y has been shedding genes. If this trend continues, the last of its remaining 55 genes could vanish in 11 million years.

Rodents like mole voles in Eastern Europe and spiny rats in Japan have lost their Y chromosomes entirely, yet they continue to reproduce. In spiny rats, researchers identified a new s*x-determining gene near SOX9 on chromosome 3, which appears to have replaced SRY.

This discovery provides optimism that humans could also evolve a new s*x-determining gene. However, this evolutionary process comes with risks. If different s*x-determining systems evolve in separate populations, it could lead to reproductive isolation and the emergence of new human species.

In 11 million years, visitors to Earth might find no humans at all — or a world inhabited by multiple human species, each with its own unique way of determining s*x
Lecturer Biology: Saqib Ali