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An allele is the different forms of a gene. For example the gene for eye colour has the alleles; brown, blue, green etc. In every person there are two alleles for every gene but both alleles are not always the same. They can be dominant and recessive; dominant alleles are expressed no matter what other allele is present, recessive alleles require both alleles to be the recessive one to be expressed. E.g. say B is the allele for brown eyes and b is the allele for blue eyes. Brown is dominant therefore if someone had Bb or BB they'd have brown eyes and if they had bb their eyes would be blue.
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What is Having two unlike genes for the same trait?
When two alleles differ from each other, such as Tt, it is called heterozygous, hetero meaning different. When alleles are the same (TT) it is called homozygous, homo meaning same.
What is a Genotype in which both alleles are the same?
A genotype in which both alleles are the same is called homozygous. This means that the individual has two identical alleles for a particular gene (e.g., AA or aa). Homozygous genotypes can be either homozygous dominant (both alleles are dominant) or homozygous recessive (both alleles are recessive).
An organism that has two diffrent alleles for a trait?
Is called a heterozygote (hetero- meaning different, and zygote being the sex cell). Heterozygotes have two different alleles of a particular gene, one in each of their sets of chromosomes. As apposed to homozygotes which have two of the same alleles of a gene.
Two different forms of the same gene are called?
Alleles
What happens when both alleles of a gene pair independently express in a heterozygote?
Then a combination of the two visual forms of the alleles (meaning any visual things the alleles cause get combined) is formed. Either that, or one pair dominates the other, and the new person becomes a carrier of the dominated pair.
What is the a blood type for alleles?
Blood type is determined by the presence of specific alleles for the ABO blood group system. There are three main alleles: A, B, and O. The A and B alleles are co-dominant, meaning that if both are present (genotype AB), both antigens are expressed on the red blood cells. The O allele is recessive, so an individual must have two O alleles (genotype OO) to express the O blood type.
What are contrasting forms of genes called?
Alleles
What type of alleles mask recessive alleles?
Dominant alleles :-)
What are the 3 alleles for blood types?
The three alleles for blood types are A, B, and O. These alleles determine the presence of specific antigens on the surface of red blood cells. The A and B alleles are co-dominant, meaning that if both are present, both antigens will be expressed, resulting in blood type AB. The O allele is recessive, so it will not produce any antigens if paired with either A or B.
What is the difference between heterozygous and homozygous alleles?
You're looking at a gene which contains 2 alleles (meaning variations of that gene). Let's call it "A."Remember that you get 2 copies of EACH gene (one from mom, one from dad).
What is an organism that has two different alleles called?
There are three alleles, the dominant, uppercase 'T', and recessive, 't'. There is also codominance, which is when two separate alleles neither control and create something entirely diffierent ie: Straight haid allels, 'S', and curly hair allele, 'C', create wavy hair. The correct answer to this question is: Heterozygot. An organism with the same alleles at a gene locus is called a Homozygot. Hetero- often meaning "different" as in "Heterosexual -> different sex attraction " and "Homo-" often meaning "same" as in "homosexual -> same sex attraction".
What term describes a pair of alleles that are the same?
Alleles that are the same = homozygous Alleles that are different = heterozygous
