Name: Genetic Mechanisms of Sex Determination
Uploaded: 2019-07-19
Duration: 4 min 34 s
Description: In many species, sex determination is genetic: males and females have different alleles or even different genes that specify their sexual morphology

Question

Explain with an example the inheritance of dihybrid cross. How is it different from monohybrid cross?

Accepted Answer

Mendel's second experiment: Dihybrid Cross: In this experiment, Mendel cross two different pea plants considering two characters with all four varieties. He observed that the dominant and recessive traits of a single character are not strictly to appear together. On this basis, Mendel concluded that each contrasting variety is independent to make combinations with other traits. This can be explained with the help of the following cross:

The ratio of the four combinations is:

Round and yellow: 9

Round and green: 3

Wrinkled and yellow: 3

Wrinkled and green: 1

The above combinations show that each contrasting variety of a trait is independent to make different combinations during a cross. This results in variations.

Difference between monohybrid and dihybrid cross:

Characteristics Monohybrid cross Dihybrid cross

Definition A monohybrid cross is a genetic cross in which only one character is considered and therefore a single pair of genes is involved. A dihybrid cross is a genetic cross in which two characters are considered and therefore two pairs of genes are involved.

Characteristics Monohybrid cross Dihybrid cross

Applicability of laws Monohybrid cross determines the dominance between the two varities of character. Dihybrid cross determines that the two varieties of the character are independent to each other.

Explain with an example the inheritance of dihybrid cross. How is it different from monohybrid cross?

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