Explanation: The heterozygous allele can be defined as the condition in which the organism has two different alleles of the gene. It is represented as Rr, means a capital letter and a small letter. This dominant and recessive condition decides the genotype and phenotype of organism.

What is RR and RR?

Rr = round. rr = wrinkled. The gametes for each individual could be either R or r, with a 50% chance for either. In this case, the genotypic ratio would be 1:2:1. Another way to think of this would be 1 individual with the genotype RR, 2 individuals with the genotype Rr, and 1 individual with the genotype rr.

What does the notation RR means to genetic?

An individual who carries two copies of the same allele (i.e. RR or rr) is called a homozygote (homo = same, zygote = embryo). Homozygotes produce genoctypially identical offspring when allowed to self-fertilize. There are dominant homozygotes (i.e. RR individuals) and recessive homozygotes (i.e. rr individuals).

What type of genotype is RR?

What does the notation TT mean to geneticists?

The notation Tt means the heterozygous condition, wherein the homologous pair contains different alleles of a gene. … ‘Tt’ refers to the heterozygous condition with a dominant and a recessive allele and tallness being the dominant trait, it is expressed in the phenotype.

Is RR a dominant trait?

In this case, three combinations of alleles (genotypes) are possible: RR, Rr, and rr. … Thus, allele R is dominant over allele r, and allele r is recessive to allele R. Dominance differs from epistasis, the phenomenon of an allele of one gene masking the effect of alleles of a different gene.

Is DD dominant or recessive?

Humans have two versions of all autosomal genes, called alleles, one from each parent. The recessive trait is hidden in the heterozygous individual (Dd) if the other allele is inherited in a dominant fashion, and so this person is a called a “carrier” of the recessive allele, but does not manifest the disease or trait.

What will be the genotypic ratio of the cross RR and RR?

For a test cross between two organisms with the genotype Rr, there will be four possible results; RR, Rr, Rr, rr. This gives us a ratio of 1:2:1, which is the genotypic ratio for the cross between Rr and Rr.

Is FF heterozygous or homozygous?

What is the genotypic ratio of RR?

Your genotypic ratio is 25% (RR), 50% (Rr), and 25% (rr).

Is blue eyes a genotype or phenotype?

Finally, the genotype of an organism with two recessive alleles is called homozygous recessive. In the eye color example, this genotype is written bb. Of these three genotypes, only bb, the homozygous recessive genotype, will produce a phenotype of blue eyes.

Is a widow’s peak a genotype or phenotype?

The genotypes WW and Ww will produce a widow’s peak (the dominant phenotype) and the ww genotype will produce no widow’s peak (the recessive phenotype). If we know the genotype of the parents, we can predict the possible genotypes and phenotypes in their offspring (first generation).

What is the genotype of someone who Cannot roll their tongue?

The ability to roll one’s tongue is a dominant trait. A person who cannot roll his/her tongue would be: a. … 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.

What is a different form of gene called?

An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.

Are alleles DNA?

Except in some viruses, genes are made up of DNA, a complex molecule that codes genetic information for the transmission of inherited traits. Alleles are also genetic sequences, and they too code for the transmission of traits. … The short answer is that an allele is a variant form of a gene.

Is PP genotype or phenotype?

A simple example to illustrate genotype as distinct from phenotype is the flower colour in pea plants (see Gregor Mendel). There are three available genotypes, PP (homozygous dominant ), Pp (heterozygous), and pp (homozygous recessive).