What is it called when offspring have two different versions of an allele?

What is it called when offspring have two different versions of an allele?

In other cases, each parent provides a different allele of a given gene, and the offspring is referred to as heterozygous (“hetero” meaning “different”) for that allele.

What is a regressive gene?

A recessive gene is a gene that can be masked by a dominant gene. In order to have a trait that is expressed by a recessive gene, such as blue eyes, you must get the gene for blue eyes from both of your parents. You might remember the word recessive from biology, where it most often appears.

What is it called when there are 2 or more genes that influence a trait?

Inheritance. Polygenic inheritance occurs when one characteristic is controlled by two or more genes. Often the genes are large in quantity but small in effect. Examples of human polygenic inheritance are height, skin color, eye color and weight. Polygenes exist in other organisms, as well.

What are the 2 types of traits which are passed from parents to offspring?

The two types of alleles are dominant and recessive. A dominant allele is written as a capital letter, and a recessive allele is written as a lowercase letter. If a gene pair contains a dominant allele, then the offspring will show this dominant trait.

What type of gene is always expressed?

dominant gene
genetic terms

Term	Definition
dominant gene	a gene that is always expressed, that is directly detectable in the individual
recessive gene	a gene that is only expressed when two identical copies coding for the same trait are present, one from the mother, one from the father

What is only expressed in the homozygous state?

Recessive. An allele that is only expressed when present in a homozygous condition, but being “hidden” by the expression of a dominant allele in the heterozygous condition.

What is an example of codominance?

Codominance means that neither allele can mask the expression of the other allele. An example in humans would be the ABO blood group, where alleles A and alleles B are both expressed. So if an individual inherits allele A from their mother and allele B from their father, they have blood type AB.

What traits are not inherited?

Acquired traits are synonymous with acquired characteristics. They are not passed on to offspring through reproduction. The changes that constitute acquired characteristics can have many manifestations and degrees of visibility, but they all have one thing in common.

What is not expressed when the dominant form is present?

Recessive ones are only expressed when the dominant one is not present.

How are alleles related to the expression of a gene?

Certain alleles have the ability to dominate the expression of a particular gene. For example, if a child has received a blue-eye allele from their father and a brown-eye allele from their mother, the child will have brown eyes because the brown-eye allele is dominant over the blue eye allele.

Is it possible to have more than two alleles for a gene?

Mendel examined the inheritance of genes with just two allele forms, but it is common to encounter more than two alleles for any given gene in a natural population. Two alleles for a given gene in a diploid organism are expressed and interact to produce physical characteristics.

What do you call an individual with two recessive alleles?

If the two alleles are different, the individual is called heterozygous. The presence of an allele does not promise that the trait will be expressed in the individual that possesses it. In heterozygous individuals, the only allele that is expressed is the dominant. The recessive allele is present, but its expression is hidden.

How are genes expressed in dominant and recessive patterns?

For a gene that is expressed in a dominant and recessive pattern, homozygous dominant and heterozygous organisms will look identical (that is, they will have different genotypes but the same phenotype), and the recessive allele will only be observed in homozygous recessive individuals.