Animals

Difference between monohybrid and dihybrid

Main difference

Hybrid is a use of the word for a mixed race, with respect to biology, the offspring of two organisms such as plants or animals of different species is called a hybrid. One of the common examples of hybrid is Mule, which is a hybrid, which arises as a result of crossing between donkey and horse. Monohybrid is a hybrid heterozygous for a particular gene. And a dihybrid is a hybrid heterozygous for the alleles of two different genes. The key difference between monohybrid and dihybrid is genetic disposition Monohybrid parents have only single trait difference, when they cross or reproduce, the process is called monohybrid cross, while in a dihybrid, parents have two trait differences and when they are crossed, the process is dihybrid crossing.

Comparative chart

Monohybrid Dihybrid
Sense Mono means mono and hybrid means a mixed race. Di means single and hybrid means a mixed race.
Traits in parents Monohybrid parents have a unique trait difference. The dihybrid parents have a double difference in traits.
Used for Monohybrid crossing is used to study the inheritance of alleles from a single pair. A dihybrid cross is used to study the inheritance of two different alleles.
Genotypic reason The monohybrid genotypic ratio is 1: 2: 1 from F2 generation. The dihybrid genotypic ratio is 1: 2: 1: 2: 4: 2: 1: 2: 1.
Phenotypic ratio The phenotypic ratio of monohybrid is 3: 1 from F2 generation. 9: 3: 3: 1.
Cross match relationship The monohybrid crossmatch ratio is -1: 1. -1: 1: 1: 1.
What is monohybrid?

Mono means mono and hybrid means a mixed race. Monohybrid is that type of hybrid in which only a single trait difference is present in the parents; this hybrid has a heterozygous configuration in a specific gene. A monohybrid cross is a cross between two normal organisms of different species to study the inheritance of a single pair of alleles. As a result, it produces some genotypic, phenotypic, and test crossmatch ratios. The genotypic monohybrid ratio of the F2 generation is 1: 2: 1; the monohybrid phenotypic ratio is 3: 1 and the test cross ratio in monohybrid crosses is -1: 1. In a monohybrid cross, the main focus is both phenotype and genotype. For example, the phenotype of the yellow plant is (YY) and the phenotype of the green plant is (yy), when crossed, the gametes will be heterozygous. The phenotype of two will be yellow, but the genotype will be (Yy), one will be (YY) yellow and the other will be (yy) green. The phenotypic ratio will be 3: 1 and the genotypic ratio will be 1: 2: 1.

What is Dihybrid?

Di means double and hybrid means a mixed race. Dihybrid is that type of hybrid in which there are two traits of difference that are present in the parents; this hybrid has a heterozygous configuration for the alleles of two different genes. A dihybrid cross is a cross between two normal organisms of different species to study the inheritance of two pairs of alleles. As a result, it produces some genotypic, phenotypic, and test crossmatch ratios. The genotypic dihybrid ratio of the F2 generation is 1: 2: 1: 2: 4: 2: 1: 2: 1, the phenotypic dihybrid ratio is 9: 3: 3: 1, and the test cross ratio in dihybrid crosses is – 1: 1: 1: 1. In a dihybrid cross, two characteristics are crossed to obtain final results. For example, the shape of a pea and its color. One or two Y alleles will give yellow color or phenotype, while (yy) alleles will give green color. Here are two more alleles that will give the shape of a pea as round or wrinkled. The dominant allele (R) will turn the pea into a round shape and the allele (r) will turn it into a wrinkled shape.

Monohybrid vs. Dihybrid
  • Mono means mono and hybrid means a mixed race, while Di means single and hybrid means a mixed race.
  • Monohybrid parents have only a single trait difference, while dihybrid parents have a double trait difference.
  • The monohybrid cross is used to study the inheritance of alleles from a single pair and, unlike the dihybrid cross, it is used to study the inheritance of two different alleles.
  • The genotypic ratio of monohybrid is 1: 2: 1 from F2 generation and dihybrid is 1: 2: 1: 2: 4: 2: 1: 2: 1.
  • The phenotypic ratio of monohybrid is 3: 1 of F2 generation and dihybrid is 9: 3: 3: 1.
  • Monohybrid crossover ratio is -1: 1 and dihybrid crossover ratio is -1: 1: 1: 1.

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button