What is Het?

[underunden]

What does it mean when people advertise and say their animal is 100% Het or 66% het, etc.?

if you could let me know, i would be very grateful. I am so intrigued...

Jess.

 

[bredli-sli]

it for albino, 66% is usaly a clutch from a normal father/mother and a albino father/mother
100% is from a 66% mother, and a albino father,
this is just what i understand, if its 66% u only have a 66% chance at breeding albinos, i belive.
some one will know better

 

[AndrewHenderson]

Het = An abbreviation for heterozygous.

Heterozygous = Possessing two different genes for a given trait. An animal with one mutated, recessive gene still appears normal; its mutated gene can be inherited by future offspring. A co-dominant animal is heterozygous for the dominant form of its mutated gene, yet is different in appearance than both the wild-type and homozygous forms.



Basically, it carries the albino gene in a recessive form meaning it carries the gene but diesn't display signs of it. Much the same as a blonde and brunette set of parents having a child with red hair because they both carry the recessive gene.


Andrew

 

[Gecko :)]

we really need to make this question a sticky!

 

[underunden]

I thought Het stood for hetrozygous. I am learning about that currently in biology class.
Thanks for the help everyone, that cleared it out for me.

 

[Ramsayi]

what they ^^^^ said.
Let me google that for you


sorry couldn't resist

 

[Origamislice]

it for albino, 66% is usaly a clutch from a normal father/mother and a albino father/mother
100% is from a 66% mother, and a albino father,
this is just what i understand, if its 66% u only have a 66% chance at breeding albinos, i belive.
some one will know better

i thought that if you had one parent that is albino itself and the other is normal you had 100% het for albino hatchlings

 

[J-A-X]

I take no credit for this but its the best explaination that i've read....

Albino to albino = all albino hatchies,
Albino to normal = all 100% het (look normal but carry the albino gene) hatchies,
Albino to het = half albino hatchies, half 100% het hatchies.
Het to het = 1 in 4 hatchies should be an albino, 1 in 4 hatchies should be a normal and 2 in 4 should be hets. I say should because this is based on probability. You get 66% possible hets because when you do a het to het mating out of every four you should get 3 normal looking ones. Two of these should be hets, but as you cant tell which one they are because they all look normal if you grabbed any individual there is a 66% chance that it would be a het (2/3).
Het to normal = all 50% possible het hatchies. Similar to above but all the hatchies would look normal.

 

[dtulip10]

ok so i am going to lay it down.

a few basic terms for genetics

allele-a genetic trate carried by a organism
phenotype-a physically seen trate of a organism (eg. eye color, hair colour, hight ect.)
genotype - the genetic make up of the organism of particular trate
dominant - referring to genes passed on by the parent organism, dominance is referring to the phenotype that is always going to be seen in the organism.
recessive - referring to the genes that are passed on from the parent organism that will not be shown as a phenotype but will still be present in the organism


ok so now we have that cleared up you'll know what i am talking about.
to show a dominant gene it is commonly shown as a capital letter and a recessive gene is shown as a lower case letter (eg."T"dominant and "t" recessive).

ok, say we have a brown bird and a black bird and they mate, the brown bird is homozygous recessive and the black gene is homozygous dominant,

Black bird - TT
brown bird - tt

say we have four off spring there genetic make up for the black and brown bird offsprings will be

Tt tT Tt tT (f1) (hets 100%)

all bird are now heterozygous but look black

if two birds from this f1 generation now mate together and have 4 young ones

we will have Tt+tT= TT tT Tt tt (f2)

so we now have one brown bird which is homozygous for a recessive trate and three black birds two are Heterozygous and one is Homozygous.

we would say in this generation we have TT (homozygous) and Tt tT (heterozygous) so with this generation we have a 66% chance of getting a het and 33% chance of not getting a het and of course the 33% chance of a pure homozygous recessive. (the golden child)

and thats as far as i am taking basic mendels genetics 101, if you want to know more use your internet.

cheers Dayle


p.s. sticky that i am not typing it again

 

[otomix]

well done guys! Thats the most basic yet informative I have read yet (with specifics to the brown birds on a reptile forum! ) but in all honesty, its a laymans guide to genetics. This should definitely be a sticky!

 

[dtulip10]

well done guys! Thats the most basic yet informative I have read yet (with specifics to the brown birds on a reptile forum! ) but in all honesty, its a laymans guide to genetics. This should definitely be a sticky!

cheers otomix that is as basic as i can put it