How many genotypes are possible with N alleles?

How many genotypes are possible with N alleles?

WITH A GIVEN NUMBEI~ OF GENES air of allelomorphs at each of n un]inked loci in a diploid, 3″ distinct genotypes are possible.

How do you determine the number of genotypes from alleles?

Number of genotypes for a given number of alleles Given n alleles at a locus, the number genotypes possible is the sum of the integers between 1 and n: With 2 alleles, the number of genotypes is 1 + 2 = 3. 3 alleles there are 1 + 2 + 3 = 6 genotypes. 4 alleles there are 1 + 2 + 3 + 4 = 10 genotypes.

How many genotypes does 8 alleles have?

36 possible genotypes
Therefore, 8 alleles of a gene can have 36 possible genotypes in the population.

How do you write X linked genotypes?

X-linked alleles require a specific notation: Xc or X+ where the “+” represents the dominant allele and the lowercase letter the recessive allele. Females will have two X-linked alleles (because females are XX), whereas males will only have one X-linked allele (because males are XY).

How many genotypes are possible?

six different genotypes
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. How are blood types related to the six genotypes?

How do you determine the number of 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.

Where is the genotype in a Punnett square?

To construct a Punnett square, the genotypes of both parents must be known. One parent’s alleles are listed across the top of the table, and the other parent’s alleles are listed down the left hand side. The resulting offspring genotypes are produced at the intersection of the parent’s alleles.

What is the genotype of RR?

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. The predicted inheritance pattern of the offspring results in a 1:2:1 ratio of the genotype.

How do you calculate the number of phenotypes?

How do you write X-linked alleles?

X-linked alleles require a specific notation: X c or X + where the “+” represents the dominant allele and the lowercase letter the recessive allele. Females will have two X-linked alleles (because females are XX), whereas males will only have one X-linked allele (because males are XY).

What does X linked mean in genetics?

X-Linked Inheritance. Traits that are determined by alleles carried on the X chromosome are referred to as X-linked. X-linked alleles require a specific notation: X c or X + where the “+” represents the dominant allele and the lowercase letter the recessive allele.

How do you calculate the number of genotypes for a gene?

So the number of genotypes for a gene with n alleles is N + (N^2 – N)/2 = (N^2 + N)/2. For N = 2 this number is the obvious 3; for N = 6 its 21.

How many genotypes are there if there are 2 alleles?

If 2 alleles, A and a, then n=2 and there are 3 possible genotypes AA, Aa, aa: 2 (2+1)/2. However, if the frequency of an allele in the population or sample is low, there may be no instances of some genotypes in the population.