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Genetics: Analysis and Principles 4th Edition by Robert Brooker
Edition 4ISBN: 978-0077474904Genetics: Analysis and Principles 4th Edition by Robert Brooker
Edition 4ISBN: 978-0077474904 Exercise 1
What is a genetic cross
Explanation
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Verified
The genetic cross is a method, used in the transmission genetics. This method, explains about how the genes or characters, which are transmitted from one generation to other generation.
The cross between the two individuals, having different types of characters yields the progeny with new characters. Some, of the progeny have the similar genetic makeup like their parents or some, got different genetic makeup unlike their parents.
The genetic cross is existed in different forms they are:
• Monohybrid cross (the cross between the individuals by considering single character or different alleles at single genetic locus).
• Di hybrid cross (the cross between the individuals by considering two characters or different alleles at two genetic loci).
• Tri hybrid cross (the cross between the individuals by considering three characters or different alleles at three genetic loci).
For example the monohybrid cross is as follows:
The monohybrid cross is explained as the cross between the individuals, by considering single character or different alleles at single genetic locus.
The monohybrid cross by taking single character the height of plant. Here, one tall plant having Tall character
is crossed with the other plant having Dwarf character 
. In the first generation the obtained plant have Tall character, but heterozygote in nature. Upon formation of gametes, the cross between the gametes, leads to the production of three tall plants, among the three one is homozygote, and two are heterozygote in nature.
The F 2 genotypic ratio is
, and the phenotypic ratio is 
. 
The cross between the two individuals, having different types of characters yields the progeny with new characters. Some, of the progeny have the similar genetic makeup like their parents or some, got different genetic makeup unlike their parents.
The genetic cross is existed in different forms they are:
• Monohybrid cross (the cross between the individuals by considering single character or different alleles at single genetic locus).
• Di hybrid cross (the cross between the individuals by considering two characters or different alleles at two genetic loci).
• Tri hybrid cross (the cross between the individuals by considering three characters or different alleles at three genetic loci).
For example the monohybrid cross is as follows:
The monohybrid cross is explained as the cross between the individuals, by considering single character or different alleles at single genetic locus.
The monohybrid cross by taking single character the height of plant. Here, one tall plant having Tall character
is crossed with the other plant having Dwarf character . In the first generation the obtained plant have Tall character, but heterozygote in nature. Upon formation of gametes, the cross between the gametes, leads to the production of three tall plants, among the three one is homozygote, and two are heterozygote in nature. The F 2 genotypic ratio is
, and the phenotypic ratio is . 
Genetics: Analysis and Principles 4th Edition by Robert Brooker
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