Distinguish between: Test Cross and Back Cross.

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Test Cross Back Cross
$1$. It is a cross between an $F_1$ hybrid and a homozygous recessive parent. $1$. It is a cross between an $F_1$ hybrid and any of its parents (either dominant or recessive).
$2$. It is used to determine the genotype of an organism showing a dominant phenotype. $2$. It is used to improve the traits of a specific variety by introducing genes from a parent.
$3$. All test crosses are back crosses. $3$. All back crosses are not necessarily test crosses.

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