A cross in which an organism showing a dominant phenotype is crossed with recessive parent in order

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4.Principles of Inheritance and Variation

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A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called

monohybrid cross

back cross

test cross

dihybrid cross.

(AIPMT-2010)

Solution

(c) : Test cross is performed to determine the genotype of $F_2$ plant. In a typical test cross an organism showing dominant phenotype and whose genotype is to bedetermined is crossed with one that is homozygous recessive for the allele being investigated, instead of selfcrossing. The progenies of such a cross can easily be analysed to predict the genotype of the test organism. Given ahead is an illustration of test cross:

Standard 12

Biology

The leaf colour of certain plants is controlled by one gene. For that gene, the allele $G =$ orange and $g =$ green. You have a plant with orange leaves, but do not know whether that plant's genotype is $GG$ or $Gg.$

If you cross your unknown plant with one of the plants whose genotype is listed below, you will be able to determine your unknown's genotype. With which plant would you cross it?

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Hybrid breakdown refers to the condition when offspring are physiologically inferior to the following generation

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Do you think Mendel’s laws of inheritance would have been different in the characters that he choose were located on the same chromosome ?

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Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.

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Which of the following statements are false?

$I.$ A Dominant allele determines the phenotype when paired with a recessive allele

$II.$ A recessive allele is weaker than a dominant allele

$III.$ A recessive allele do not shows its effects when paired with a dominant allele

$IV.$ A dominant allele is always better for an organism

medium

A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called

Solution

Similar Questions

Hybrid breakdown refers to the condition when offspring are physiologically inferior to the following generation

Do you think Mendel’s laws of inheritance would have been different in the characters that he choose were located on the same chromosome ?

Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.

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