What is principle of dominance and recessiveness?

Answer 1

The law of dominance is Mendels Law, which is a principal in genetics limited and modified by subsquent discovery of the phenemonon of linkage. The law of dominance is Mendels Law, which is a principal in genetics limited and modified by subsquent discovery of the phenemonon of linkage.

Answer 2

PRINCIPLE OF DOMINANCE AND RECESSIVENESS- This principle determines the presence of similar and differences among family members. There are traits assured of appearing in the child, whenever present these are known as dominant traits, other traits that are recessive only in the absence of a dominant traits

Answer 3

The commonly understood principle of dominance and recessiveness is that of complete dominance. For many genes, there is one or more alleles (alleles are variations of a gene, such as brown or blonde hair). Let's say there are two alleles for the gene for being able to roll your tongue. The inability to roll tongue will be represented by R and the ability by r. You can receive either the alleles RR Rr or rr. RR will mean you cant roll your tongue. rr will mean you can. Then you have Rr, which is trickier. For different genes, the result of two different alleles would be different. For this case, scientists have worked out that if you receive one of each gene, the DOMINANT gene is the inability to roll your tongue. because it is dominant, it over-rides the RECESSIVE allele and is the allele that affects the 'phenotype' (or what you see). There are other forms of dominance though, such as incomplete dominance and co-dominance. In incomplete dominance, both alleles are combined to produce a new phenotype. Such as in some species of flowers, if you cross a red and white flower you will get a pink one. Co-dominance is when both the alleles are expressed as a combination. Such as if you had a red cattle dog and a blue one and you crossed the two and a red and blue cattle dog resulted. These cases involve only two alleles for each gene, but often there can be multiple alleles which explains the huge variation in the human population and why we never see two absolutely identical people who arose from a different embryo. Dominance and recessiveness is very important in the understanding of genetic illness because different diseases display different forms of dominance and many are recessive. This also effects inheritance and explains why healthy parents can pass 'disease alleles' to their children who may exhibit the full blown disease. The commonly understood principle of dominance and recessiveness is that of complete dominance. For many genes, there is one or more alleles (alleles are variations of a gene, such as brown or blonde hair). Let's say there are two alleles for the gene for being able to roll your tongue. The inability to roll tongue will be represented by R and the ability by r. You can receive either the alleles RR Rr or rr. RR will mean you cant roll your tongue. rr will mean you can. Then you have Rr, which is trickier. For different genes, the result of two different alleles would be different. For this case, scientists have worked out that if you receive one of each gene, the DOMINANT gene is the inability to roll your tongue. because it is dominant, it over-rides the RECESSIVE allele and is the allele that affects the 'phenotype' (or what you see). There are other forms of dominance though, such as incomplete dominance and co-dominance. In incomplete dominance, both alleles are combined to produce a new phenotype. Such as in some species of flowers, if you cross a red and white flower you will get a pink one. Co-dominance is when both the alleles are expressed as a combination. Such as if you had a red cattle dog and a blue one and you crossed the two and a red and blue cattle dog resulted. These cases involve only two alleles for each gene, but often there can be multiple alleles which explains the huge variation in the human population and why we never see two absolutely identical people who arose from a different embryo. Dominance and recessiveness is very important in the understanding of genetic illness because different diseases display different forms of dominance and many are recessive. This also effects inheritance and explains why healthy parents can pass 'disease alleles' to their children who may exhibit the full blown disease. The law of dominance and recessiveness says that dominant genes will typically be the ones that show up in an organism. Recessive traits only appear in the absence of dominant traits.

Answer 4

Dominant traits are traits whose characteristics that are shown.

Recessive traits are traits whose characteristics are only shown when the allele is paired with another recessive allele.

For example:

Blood type:

Three types of alleles

Ia, Ib, Io

Ia, Ia = Type A blood

Ia, Ib = Type AB blood

Ia, Io = Type A blood

Ib, Ia = Type AB blood

Ib, Ib = Type B blood

Ib, Io = Type B blood

Io, Io = Type O blood

Note: Ia and Ib are co-dominant (Both traits are shown at same time) and Io is recessive

Answer 5

when a gene pair is heterozygous Only one of the two genes is physically expressed (Dominant) while the other is hidden (Recessive)