This question about genetics, it is important to know the principles of this subject, knowing these subjects we can say that....
According to the picture, we can conclude that..
A) The genetic basis of this trait is that red hair is a genotypic, resective trait, of which the gene is only expressed, and red beard and hair is not expressed and epistasis (Condition in which an allele of a gene blocks the expression of the alleles of another gene), being a dominant characteristic (gene exerts dominance when it is expressed even in a single dose, that is, in heterozygosity), with these statements we reach the conclusion that red hair is a characteristic of a resective gene and red beard and hair is a dominant trait.
B) Observing the finger diagram, we conclude that red hair is a characteristic common to individuals in this family, as all generations will express this characteristic.
What are alleles?
Alleles are alternative forms of a given gene and occupy the same locus on homologous chromosomes. When we refer to locus, we are talking about the position of the gene on the chromosome; when we talk about homologous chromosomes, we refer to chromosomes that have genes for the same trait.
It is important to note that alleles are always represented by letters. The allele is represented by a lowercase letter when it is recessive, that is, when it is expressed only in pairs (Ex.: aa). The dominant allele is represented by a capital letter and is expressed even in a single dose (Ex.: AA or Aa).
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