I’ve googled it, but all the answers are telling me is that it’s been way too long since those genetics lessons in middle school
In: 13
Theres nothing about recessive genes that make them inherently less likely or less desirable to pass on, and they’re still *there* even if they aren’t expressed.
If you imagine the genes as red and blue cards, red cards always go on top of blue cards. If you lay those out in every possible variation (RR, RB, BR, BB) the blue card is only ever visible in 1/4 of those combinations, the one with two blue cards. But there is an equal number of red and blue cards, if you shuffle them together and pick a card at random you have an equal chance (1/2) of drawing either color. So they don’t die out, you just only actually see it 1/4 times
If a recessive gene exists in the population, why would you expect it to die out without knowing anything about it? By default, you should expect a gene to stay at the same frequency in the population unless it’s helping or harming the organisms that carry it.
If a recessive gene exists in the population, why would you expect it to die out without knowing anything about it? By default, you should expect a gene to stay at the same frequency in the population unless it’s helping or harming the organisms that carry it.
If a recessive gene exists in the population, why would you expect it to die out without knowing anything about it? By default, you should expect a gene to stay at the same frequency in the population unless it’s helping or harming the organisms that carry it.
Two reasons. Either they offer some benefit, or they cause no harm.
My mom had dark brown eyes. My dad had light brown eyes and siblings with blue or green eyes. I have brown eyes, my wife has green eyes.
We have a kid with brown eyes and one with blue eyes.
So…I inherited brown from my mom, and my dad must have been a carrier for blue and passed that on to me. It was recessive, but did neither me nor my dad any harm. My wife must have blue and green, with blue being recessive. It caused her no harm.
One kid inherited brown from me, which was dominant over whatever my wife gave her. The other must have inherited recessive blue from both of us. It has caused him no harm. His child has blue eyes.
So recessive blue has passed from one of my dad’s parents down to my son and grandson, even though my dad and l had brown eyes, because there was no reason for it to die out – it caused no harm.
Two reasons. Either they offer some benefit, or they cause no harm.
My mom had dark brown eyes. My dad had light brown eyes and siblings with blue or green eyes. I have brown eyes, my wife has green eyes.
We have a kid with brown eyes and one with blue eyes.
So…I inherited brown from my mom, and my dad must have been a carrier for blue and passed that on to me. It was recessive, but did neither me nor my dad any harm. My wife must have blue and green, with blue being recessive. It caused her no harm.
One kid inherited brown from me, which was dominant over whatever my wife gave her. The other must have inherited recessive blue from both of us. It has caused him no harm. His child has blue eyes.
So recessive blue has passed from one of my dad’s parents down to my son and grandson, even though my dad and l had brown eyes, because there was no reason for it to die out – it caused no harm.
Two reasons. Either they offer some benefit, or they cause no harm.
My mom had dark brown eyes. My dad had light brown eyes and siblings with blue or green eyes. I have brown eyes, my wife has green eyes.
We have a kid with brown eyes and one with blue eyes.
So…I inherited brown from my mom, and my dad must have been a carrier for blue and passed that on to me. It was recessive, but did neither me nor my dad any harm. My wife must have blue and green, with blue being recessive. It caused her no harm.
One kid inherited brown from me, which was dominant over whatever my wife gave her. The other must have inherited recessive blue from both of us. It has caused him no harm. His child has blue eyes.
So recessive blue has passed from one of my dad’s parents down to my son and grandson, even though my dad and l had brown eyes, because there was no reason for it to die out – it caused no harm.
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