Explain the test - cross. I have to explain the usefullness of the test-cross. I had my paper written then was told I need to incorporate the Punnett square, monohybrid cross, dihybrid cross etc. into the paper. I am now confused - maybe I have just researched so much I cannot make sense of any of it. How is the Punnett Square, test cross, monohybrid cross, dihybrid cross all tied in together?
Let's start with simple definitions for these terms (from http://www.thefreedictionary.com):
Punnett Square-Â A method for predicting the ratios of phenotypes in offspring, given the phenotypes and/or genotypes of the parents. Generally, the alleles of two or fewer genetic loci are worked with per square.
Test cross- a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring.
monohybrid cross- hybridization (breeding) using ...
Definitions and relation between test crosses, monohybrids, dihybrids and Punnett squares.