Easy one is and one isn't u don't have to ask that Hahahaha
Alleles are alternate versions of genes that code for certain phenotypes, or traits. The traits of an individual are a result of the interaction between their genotype (alleles) and the environment.
If there is a trait that one gets but is not inherited if could just be a recessive trait from a past generation that was skipped Or it could be that that person ect. is special
genes
It is a dominant trait. You only need one gene of a dominant trait for that trait to be expressed. You need two copies of the recessive trait in order for the trait to be expressed.
The gametes (sex cells) that combine to form a new organism in sexual reproduction each contain one set of the instructions for the genes of the new organism, that is, one set each for each trait.
A scar is not a trait because a trait is something inherited from one generation to the next. A scar comes from something you inflict upon yourself.
One parent has a recessive trait. For example: One parent has blood type AB, the other has blood type OO.
Colour blindness
they jellyfish eat fish
If one parent has a dominant trait and and another parent has a recessive trait, then the recessive trait gets hidden while the dominant trait gets shown.
A polygenic trait is a trait in which multiple sets of alleles are used to determine the trait, whereas in a single gene trait aka. a Mendelian trait, only one pair of alleles is used.
ALD can be inherited as an autosomal recessive trait (requiring two alleles, one from each parent) and as an X-linked trait.