There are three common alleles in the ABO system. These alleles segregate and assort into six genotypes, as shown in Table 1. As Table 1 indicates, only four phenotypes result from the six possible ABO genotypes.
How many types of phenotype are there?
With one locus and additive effects we have three phenotypic classes: AA, Aa and aa.
How do you determine the number of different phenotypes?
There is a range of phenotypes, but most of the offspring are similar in color to the parents. If n = the number of gene pairs, then (2n + 1) will determine the total number of categories of phenotypes.
What are 3 possible phenotypes?
If the only alleles for hair texture were straight and curly, there would be three phenotypes: straight, curly, and wavy. However, you asked for something a little different. You wanted three phenotypes that are all equally represented in the population.
How many different phenotypes are possible for a single gene?
For a single gene that is expressed following a complete dominance pattern, there are two possible phenotypes: the one associated with the dominant allele (shown by homozygous dominant and heterozygous individuals), and that of the homozygous recessive.
What are the 3 types of genotypes?
There are three types of genotypes: homozygous dominant, homozygous recessive, and hetrozygous.
How many possible phenotypes are there for ABO blood groups?
The genetic locus, ABO locus encodes for the ABO blood group antigens. It has 3 allelic forms – A form, B form and O form. A fetus receives one of these three alleles from each of its parents. This produces four possible phenotypes (blood types) and six possible genotypes.
How many different genotypes are there?
A description of the pair of alleles in our DNA is called the genotype. Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus. The different possible genotypes are AA, AO, BB, BO, AB, and OO.
What are the differences between genotypes and phenotypes?
The genotype is a set of genes in the DNA which are responsible for the unique trait or characteristics. Whereas the phenotype is the physical appearance or characteristic of the organism. Thus, we can find the human genetic code with the help of their genotype.
Which of the following are phenotypes?
A phenotype is an individual’s observable traits, such as height, eye color, and blood type. The genetic contribution to the phenotype is called the genotype.
Can As marry as?
However, AS and AS should not marry because there is every chance of having a child with Sickle Cell Disease, while AS and SS shouldn’t think of marrying. And definitely, SS and SS must not marry since there’s absolutely no chance of escaping having a child with the sickle cell disease.
How many genotypes are possible with 8 alleles?
Therefore, 8 alleles of a gene can have 36 possible genotypes in the population.
How many genotypes and phenotypes are there for blood?
The ABO blood group antigens are encoded by one genetic locus, the ABO locus, which has three alternative (allelic) forms—A, B, and O. A child receives one of the three alleles from each parent, giving rise to six possible genotypes and four possible blood types (phenotypes).
What are the possible phenotypes of the offspring?
Eye color, hair color, pod shape, and flower position are all examples of phenotypes. In this example, it asked you to do a cross between two parents who were homozygous dominant for eye color. Looking at the possible offspring, each box (or possible offspring) has two copies of the dominant gene.
What are the phenotypic and genotypic ratios?
The phenotypic ratios are the ratios of visible characteristics. The genotypic ratios are the ratios of gene combinations in the offspring, and these are not always distinguishable in the phenotypes.