How many phenotypes are in a Punnett square?
16 phenotypes
A Punnett Square for a tetrahybrid cross contains 256 boxes with 16 phenotypes and 81 genotypes. A third allele for any one of the traits increases the number of genotypes from 81 to 108.
How do you find the phenotypic ratio in a Punnett square?
Your Punnett square contains one YY, two Yy and one yy, so your genotypic ratio is 1 : 2 : 1. If Y is dominant and y is recessive, there are only two phenotypes because YY and Yy have the same phenotype, so your phenotypic ratio is 3 : 1 (the two Yys plus the one YY make 3 of that phenotype).
What goes on the inside of the Punnett square?
What do the letters inside the Punnett Square represent? They represent the possible genotypes for their offspring. If a dominant trait shows up in the offspring, then the unknown (parent) is a hybrid, or pure dominant.
How to find genotype ratio?
To find the genotypic ratio,count the number of times each combination appears in the grid,starting in the upper left square.
What are the different types of phenotypes?
The possible human phenotypes for blood group are type A, type B, type AB, and type O. Type A and B individuals can be either homozygous (I AI A or I BI B, respectively), or heterozygous (I Ai or I Bi, respectively).
What is an example of a heterozygous genotype?
Heterozygous: The human blood type AB , which is determined by the genotype, AB, snapdragon flower color, and the codominance of the hair color in roan horses are the examples of heterozygous.
What is a possible phenotype?
A phenotype represents every possible way that the genotype manifests itself in the organism. Since each organism has its own unique genotype, there is no possible way to list all genotypes. However, some human traits have been genotyped.