Genetic Engineering

Why a person carries only two genes for a trait?

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No, if a person carries a single dominant gene they will have that trait. Thus if the trait is for a disorder, they will have the disorder. Only recessive traits have carriers.

A recessive trait can only be passed along if both parents carry at least one of the recessive genes to the child. If both parents manifest the trait (that is, if both parents have both recessive genes), then the child will manifest (that is, carry both recessive genes and display) the recessive trait. If one parent manifests and the other parent only carries the trait (that is, carries one dominant and one recessive gene) then the child will definitely carry and have a 50% chance of manifesting. If both parents carry the recessive, the child is 25% likely not to carry the trait at all, 50% likely to carry and 25% likely to manifest the trait.

Their offspring will have dominant genes. However, if these offspring have offspring with an amimal with recessive genes, the recessive genes will show up.

A sex-linked trait is a trait governed by genes on only one of the two sex chromosomes.

The y chromosome, which only contains a few hundred genes.

Traits that typically will only be expressed in offspring if they inherit two copies of the genes for the trait are called Recessive traits. - Nikkkki

There are several terms that can describe this person:heterozygous dominant: The person has different alleles for a trait, and expresses only the dominant trait.hybrid: Gregor Mendel called heterozygous dominant organisms hybrids.carrier: A person who carries the recessive gene for a disease, but doesn't have the disease herself, is called a carrier because she can pass on the recessive gene to her children.

Genes are like the building blocks to traits, some are dominant, some are recessive to be simple with it. If a gene is dominant it will "show" for a particular trait. If a gene is recessive, it will only "show" if both of the genes to that trait are recessive.

Only a gene pair with two recessive genes would show the recessive trait. A gene pair with one or more dominant genes would always show the dominant trait.

Heterozygous means that it carries both dominant and recessive traits (as opposed to homozygous which carries only one) - the dominant trait is the one which is expressed (phenotype). A heterozygous trait can be expressed as Rr - "R" the dominant trait and "r" the recessive trait.

A person can only inherit sickle-cell genes if some of their ancestors came from certain regions in Africa where the inhabitants carry sickle-cell genes. A person with one sickle-cell gene has sickle-cell trait, a milder problem. If both father and mother pass on sickle-cell genes, the child, with two genes, will have sickle-cell disease.

Any and all traits that are not a product of the environment stem from genes. So if a trait cannot be acquired or lost, then it is genetic.

If a trait is dominant, then an organisms heterozygous (hybrid) for that trait would normally show: A) The recessive trait only B) The dominant trait only C) A blend of the recessive and dominant traits D) A phenotype unlike that of either parent B) The dominant trait only! Reason being because heterozygous means the pair of genes are different. When this occurs, only the dominant trait is expressed.

Recessive, as in recessive genes, refers to an inherited characteristic or trait that is expressed only when two copies of the gene responsible for it are present.

No. They will each get the same genes that make a human a human except for the sex genes. The egg carries its' set of genes and all of the organelles including the mitochondria. The sperm carries only its' set of genes.

Two recessive genes or alleles. That is the only way to show any recessive trait

Dominant inheritance is dominant and determines the trait, while Recessive inheritance is hidden by the dominant trait. A recessive trait is exhibited only if both recessive genes are present. Organisms that carry recessive genes but do not exhibit theme are called carriers. If an organism is heterozygous for a dominant trait, each of its offspring has a 50 percent chance of inheriting the trait.

A polygenic effect refers to the effect of two or more genes on a single characteristic. These genes, however, only produce a small quantitative effect on a trait.

Heterozygous means that the pair of genes aren't alike. When this occurs only the dominant trait is expressed. Hope this helps :)

The different forms of a genes for a single trait are known as alleles there can be a dominate allele which always shows up when present and a recessive allele which only shows up when both alleles are recessive or there is no dominate allele

Inheritance Patterns! By studying pea plants, Mendal came up with 4 theories of inheritance patterns: 1) Alternate forms of genes exist 2) 2 genes per trait exist 3) A gamete only carries one allele 4) There is a dominant and a recessive allele

A person would show a recessive trait only when they possess two copies of the recessive allele.

Dominant trait is the one which is expressed when the homologous pair of genes controlling it are either homozygous or Hetrozygous dominant; on the other hand recessive trait has both genes to be homozygous recessive. in fact trait is controlled by the form of genes. Dominant gene expresses even when it is in the company of recessive gene. However recessive gene expresses only when in company of recessive gene

A recessive phenotype can only be observed when the individual carries both the recessive alleles for the specific trait.

It is a sex-linked trait. Genes only found on the X chromosome can result in sex-linked traits. In humans these include hemophilia and color blindness.

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