How to take Viagra. Viagra works best if it s taken approximately one hour before sexual activity. To get an erection, you will need to be sexually stimulated. Doctors usually recommend taking 50 mg once per day, but the dosage can be decreased to 25 mg or increased to 100 mg if needed.
Recessive allele: an allele that only has an effect on the phenotype when present in the homozygous state. Codominant alleles: pairs of alleles that both affect the phenotype when present in a heterozygote. Locus: the particular position on homologous chromosomes of a gene.Homozygous: having two identical alleles of a gene. Heterozygous: having two different alleles of a gene. Carrier: an individual that has one copy of a recessive allele that causes a genetic disease in individuals that are homozygous for this allele.ocus: the particular position on homologous chromosomes of a gene. Homozygous: having two identical alleles of a gene. Heterozygous: having two different alleles of a gene. Carrier: an individual that has one copy of a recessive allele that causes a genetic disease in individuals that are homozygous for this allele.
A dominant allele is an allele where its phenotype will always be represented when the allele for that gene is present.A recessive allele can be masked by a dominant allele when a dominant and recessive allele are present for the same gene. recessive allele can be masked by a dominant allele when a dominant and recessive allele are present for the same gene.