The genotype for tongue rolling could be homozygous dominant (RR) heterozygous (Rr) or homozygous recessive (rr). It should be noted that a person with the genotype RR and the genotype Rr both have the same phenotype since they can both roll their tongues, even though their genotypes are different. yright credit page.
Is rolling your tongue heterozygous?
Because tongue-rolling is recessive, the only way a person would be unable to roll his/her tongue would be if s/he were homozygous mutant. 2. The ability to roll one’s tongue is a dominant trait. A female with the ability to roll her tongue marries a man who cannot.
What type of variation is tongue rolling?
Discrete variation is either/or and is often caused by the presence or absence of a small number if genes. For example, our ability to “roll” our tongues is determined by just one gene. We can all either roll our tongue or not – there’s nothing in between.
Is tongue rolling a genotype?
An example of a gene that can be passed from a human parent to its offspring is the tongue rolling gene. … A person with the Rr genotype for tongue rolling would be able to roll his or her tongue, because he or she has the dominant allele that allows tongue rolling. So “tongue rolling” is his or her phenotype.
What is the homozygous dominant genotype for tongue rolling?
The letter T will be used to designate a tongue roller (dominant) while the letter t will be used to designate a non-roller (recessive). If a person’s genotype was TT then they are said to be homozygous dominant (homo meaning the same). If their genotype was tt then they are said to be homozygous recessive.
Is SS heterozygous or homozygous?
Specifically, heterozygous (Ss) individuals express both normal and sickle hemoglobin, so they have a mixture of normal and sickle red blood cells. In most situations, individuals who are heterozygous for sickle-cell anemia are phenotypically normal. Under these circumstances, sickle-cell disease is a recessive trait.
What are the heterozygous genotypes?
(HEH-teh-roh-ZY-gus JEE-noh-tipe) The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote).
Is RR heterozygous or homozygous?
The (RR) genotype is homozygous dominant and the (rr) genotype is homozygous recessive for seed shape. In the image above, a monohybrid cross is performed between plants that are heterozygous for round seed shape.
What is the homozygous dominant genotype?
An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.
Is rolling your Rs dominant or recessive?
Alfred Sturtevant (one of the pioneers of Drosophila genetics) described tongue rolling as a simple two-allele character, with the allele for rolling (usually given the symbol T or R) being dominant over the allele for non-rolling (t or r) (Sturtevant 1940).
Is PP genotype or phenotype?
There are three available genotypes, PP (homozygous dominant ), Pp (heterozygous), and pp (homozygous recessive). All three have different genotypes but the first two have the same phenotype (purple) as distinct from the third (white).
What is homozygous condition?
Homozygous is a genetic condition where an individual inherits the same alleles for a particular gene from both parents.
How many are homozygous dominant?
Homozygous Dominant Terms & Definitions
|Heterozygous||has one of each allele|
|Homozygous||has two of the same alleles|
|Homozygous dominant||a genotype that consists of two dominant alleles for a gene|
|Agouti allele||dominant; causes a cat’s coat to have sections that are black and sections that are another color|