#back cross

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Body Fitness

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Test Cross, Back Cross and Reciprocal Cross

Test Cross A test cross is a cross to a homozygous recessive genotype.

It may be used to establish the genotype of an individual with the dominant phenotype.

        e.g: Genotype could be AA or Aa so crossing with aa will give us different results.

                AA x aa  = All Aa (All one phenotype)

                Aa x aa = 1 Aa: 1 aa (half one phenotype, half other)

The appearance of the recessive phenotype in the offspring of a test cross indicates that the unknown genotype was heterozygous.

A test cross can also occur with 2 or more genes involved.

Back Cross A cross of an F1 to one of its parents  OR A cross of an F1 to an individual with an identical genotype to the parent

Useful because you to know the genotype of the parent and can use that as a ‘constant’.

Reciprocal Cross

1st:  Male Phenotype A x Female Phenotype B 2nd: Male Phenotype B x Female Phenotype A 

Usual test for sex linkage as if it is sex linked these crosses will produce different results. If autosomal will produce same results for both crosses.