I think that it must be evolutionarily older. If A and B came along later in human evolution, there just hasn't been enough time for them to become the more prevalent phenotypes.
These traits are called dominant traits. They will overcome the recessive gene and the dominant trait will be expressed. A recessive gene needs two alleles present in its genotype to be expressed.
Recessive traits are only visible if an individual inherits two copies of the recessive allele, one from each parent. If an individual has only one copy of the recessive allele, the dominant allele will be expressed, masking the recessive trait.
it is because that trait is more dominant. when a dominant and a recessive trait combine it is most likely that hte dominant trait will be expressed. it is only when a recessive trait combines with an another recassive trait that hte trait gets expressed(which is rare and not so commonly occuring)
Dominate them. Recessive alleles do not show in your phenotype unless you have two of the same recessive allele. But if you inherit one dominant and one recessive, it is the dominant that always shows in your phenotype.
O is the most recessive blood type. And RH- negative is recessive. There are a limited number of Blood Type Combinations. AA, AO, BB, BO, AB, OO. Blood Type can be determined with some certainty by using a Pundit Square. EXAMPLE AO x OO would result in First Filial Progeny of 50% AO and 50% OO. or AA x BO would result in FIrst Filial Progeny of 50% AO and 50% AB.
Yes, there is no possibility of a Recessive trait being dominant.
if the ratio had more recessive traits, like if you made a punnit square and you saw that there were more of the recessive traits (BB bb bb bb) then you know that the most common trait is the recessive one "bb" (considered as homozygous recessive ( i think))
These traits are called dominant traits. They will overcome the recessive gene and the dominant trait will be expressed. A recessive gene needs two alleles present in its genotype to be expressed.
Recessive traits are only visible if an individual inherits two copies of the recessive allele, one from each parent. If an individual has only one copy of the recessive allele, the dominant allele will be expressed, masking the recessive trait.
Recessive Autosomal
They're not necessarily, but they can be. When a recessive trait is more common, it likely because it was advantageous to have that trait so the species evolved to have more of it in the gene pool. Also, since dominant traits are expressed over recessive traits, natural selection has more of an effect on them.
recessive
it is because that trait is more dominant. when a dominant and a recessive trait combine it is most likely that hte dominant trait will be expressed. it is only when a recessive trait combines with an another recassive trait that hte trait gets expressed(which is rare and not so commonly occuring)
Dominate them. Recessive alleles do not show in your phenotype unless you have two of the same recessive allele. But if you inherit one dominant and one recessive, it is the dominant that always shows in your phenotype.
recessive autosomal
O is the most recessive blood type. And RH- negative is recessive. There are a limited number of Blood Type Combinations. AA, AO, BB, BO, AB, OO. Blood Type can be determined with some certainty by using a Pundit Square. EXAMPLE AO x OO would result in First Filial Progeny of 50% AO and 50% OO. or AA x BO would result in FIrst Filial Progeny of 50% AO and 50% AB.
Sex-linked recessive traits are most often seen in men. This is because men have only one X chromosome, so if they inherit a recessive allele for a sex-linked trait on their X chromosome, they will express the trait. Women, on the other hand, have two X chromosomes, so they need to inherit two copies of the recessive allele to express the trait.