A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called?
A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called?
The correct option is C Test cross
The correct option is C.
Explanation of correct option:
- It is difficult to know the genotypic composition of a dominant phenotype by simply observing it.
- Test cross is an experiment that is used to find out the genotype of a dominant offspring.
- It is performed by crossing the dominant offspring with the recessive parent.
- Example: a tall plant (unknown genotype) is crossed with a dwarf plant (known genotype). If both dominant and recessive offspring are produced in an equal ratio, then the tall plant is heterozygous. However, if all the offspring are tall, then the tall plant is homozygous.
Explanation of incorrect option:
Option A:
In a back cross, the hybrid organism is crossed with one of its parents. It is useful for achieving offspring that is genetically similar to the parent.
Option B:
Dihybrid cross involves crossing two organisms that are heterozygous for two different traits.
Option D:
A monohybrid cross is a cross between two individuals that are heterozygous for a single trait.
Final answer
A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called a test cross.
Test cross
The correct option is C.
Explanation of correct option:
- It is difficult to know the genotypic composition of a dominant phenotype by simply observing it.
- Test cross is an experiment that is used to find out the genotype of a dominant offspring.
- It is performed by crossing the dominant offspring with the recessive parent.
- Example: a tall plant (unknown genotype) is crossed with a dwarf plant (known genotype). If both dominant and recessive offspring are produced in an equal ratio, then the tall plant is heterozygous. However, if all the offspring are tall, then the tall plant is homozygous.
Explanation of incorrect option:
Option A:
In a back cross, the hybrid organism is crossed with one of its parents. It is useful for achieving offspring that is genetically similar to the parent.
Option B:
Dihybrid cross involves crossing two organisms that are heterozygous for two different traits.
Option D:
A monohybrid cross is a cross between two individuals that are heterozygous for a single trait.
Final answer
A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called a test cross.
