What is the purpose of a test cross?

Answer 1

A test cross helps to predict the probable, not actual, outcome of a genetic cross. This is what a Punnet Square is used for. You can cross just one gene, or you can do more complicated crosses that involve many genes.

For example, if your genotype is heterozygous brown eyes and homozygous blonde hair, your spouse has homozygous blue eyes and heterozygous brown hair, and you want to see the chances of your kids having blue or brown eyes and blond or brown hair, you could do a test cross to see all the possibilities.

Answer 2

Test Cross is used to identify whether an organism is heterozygous or homozygous for a dominant characteristic, by crossing it with a homozygous recessive organism.

If the organism is a heterozygote offsprings of different phenotypes are produced.

If the organism is a homozygote all the offsprings only have the dominant phenotype.

Answer 3

Humans have been "improving" animals since before written history. We may want to breed a cow that gives more milk, or milk higher in cream to give two real-world examples. A test cross is when two different lines of animals are bred to create a hybrid which is then raised to maturity to see if it demonstrates the characteristics the breeder was aiming for. If it does, then large-scale cross-breeding ensues. If not, then the animal is either culled (killed) or if it is still valuable, simply not bred to keep undesirable characteristics from entering the population.

Answer 4

To determine the presence of resessive alleles. :]

Answer 5

To predict the possible outcomes of an f2 generation of an offspring.

Answer 6

the purpose of it is to determine the unknown genotype

Answer 7

i dnt know u tell i am a student ..:/