2
Question
Read the description given below and identify the type of genetic cross.
The cross takes into account two different traits. The offsprings obtained in the second filial generation show a phenotypic ratio of 9:3:3:1. Mendel proposed his law of independent assortment based on observations form these genetic crosses.
Read the description given below and identify the type of genetic cross.
The cross takes into account two different traits. The offsprings obtained in the second filial generation show a phenotypic ratio of 9:3:3:1. Mendel proposed his law of independent assortment based on observations form these genetic crosses.
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Solution
The correct option is A Dihybrid cross
Dihybrid cross is a cross between two different lines (varieties, strains) that differ in two observed characters. For eg. if you are to consider the characters height and pod-colour, in all the dihybrid crosses conducted by Mendel, he found the the phenotypic ratio to be 9:3:3:1. Based upon such observations on dihybrid crosses, Mendel proposed a second set of generalisations that we call Mendel’s Law of Independent Assortment. The law states that ‘when two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters.
Monohybrid cross similarly is the cross between parents that differ in a single observed character. For e.g., height alone. The phenotypic ratio observed by Mendel for monohybrid cross was 3:1.
Test cross was also devised by Mendel which involves breeding of an individual expressing the dominant trait with a phenotypically recessive individual, to discover the genotype of the dominant individual.
Backcross is crossing of a hybrid with one of its parents.
Dihybrid cross is a cross between two different lines (varieties, strains) that differ in two observed characters. For eg. if you are to consider the characters height and pod-colour, in all the dihybrid crosses conducted by Mendel, he found the the phenotypic ratio to be 9:3:3:1. Based upon such observations on dihybrid crosses, Mendel proposed a second set of generalisations that we call Mendel’s Law of Independent Assortment. The law states that ‘when two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters.
Monohybrid cross similarly is the cross between parents that differ in a single observed character. For e.g., height alone. The phenotypic ratio observed by Mendel for monohybrid cross was 3:1.
Test cross was also devised by Mendel which involves breeding of an individual expressing the dominant trait with a phenotypically recessive individual, to discover the genotype of the dominant individual.
Backcross is crossing of a hybrid with one of its parents.
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