what is dominant and recessive in genetics?

Question

please clear their definition. be more specific.

Answer 1

Genes can come in two forms (alleles), dominant and recessive. As the name suggests, one is dominant over the other. Animals (or plants etc) recieve two copies of each gene (one from the mother, one from the father). Dominant is so called as there only needs to be one copy of that allele in order to show the phenotype. Recessive phenotypes need a copy from both the mother and the father.

A commonly used example is tongue rolling. This is a recessive phenotype. If your Mother cannot roll her tongue, and your father cannot they must both carry 2 copies of the recessive allele, and will each pass the recessive on to you, and you will be unable to roll your tongue.
If your mother can, and your father can't then your father will pass on the recessive, but the mother could either have one copy of the dominant allele (ie can roll the tongue) and one copy of the recessive (can't roll) or two dominants. The outcome of that is if she passes on the dominant, it over-rules your father's recessive and you CAN roll your tongue.

Dominant and recessive alleles were discovered by Gregor Mendel while he was working with pea plants. He discovered that when cross-pollinating yellow and green pea plants, initially all the offspring were yellow, but continued breeding led to green plants popping out in further generations, when two recessive alleles were passed on.

Answer 2

A dominant gene is expressed by making use of a capital letter, a recessive gene is expressed by making use of a decrease case letter, as an occasion Tt. If a gene is dominant this is going to be expressed bodily. The recessive gene isn't expressed yet remains contemporary which comprise Tt. If tall is dominant than an organism it particularly is Tt would be tall. TT is homozygous dominant = tall tt is homozygous recessive = short the recessive trait can purely be expressed whether this is homozygous Tt is heterozygous = tall heterozygous skill it has the two a dominant and recessive gene i desire this helps and that i did not confuse you much extra. Lynn

Answer 3

The standard + allele produces a functional Xase enzyme; the a allele produces a non-functional enzyme. The +a heterozygote produces half the typical amount of enzyme made by an ++ homozygote. This is sufficient for standard phenotypic expression and the phenotype of the +a heterozygote resembles that of the ++ homozygote. The variant allele a is therefore described as recessive to the wild-type + allele (or, + is dominant to a)

Answer 4

A recessive characteristic is only expressed if both parents contribute the gene to make it homozygous. A dominate gene is expressed by only one gene and can be expressed in a heterozygous group. For examplesickle cell disease manifests fully only if the woman mates with a man who has the gene. The person who carries the gene only does show sickling, though, and should not mate.

Answer 5

when 2 alleles(i.e. genes expressing different traits of the same character-like one for tall &the other for dwarf) are present together, then the one that supresses the other and gets expressed is the dominant one and the one that gets supressed is the recessive gene.

Answer 6

The character which is able to express itself is the domonant.
The charecter which remains hidden or suppressed is the recessive.