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Test Cross and Its Importance
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Dr Praveen Kumar Agrawal is teaching live on Unacademy Plus

Dr Praveen Kumar Agrawal
Ex - Faculty, Allen Kota, 22 Yrs Experience. Author - 17 books Known for best explanation Youtube : Concept Gurukul

U
Unacademy user
thanks alott mam for course, u look awesome
great explanation. i am not interested in biology. but when i tech from you .i am l owly slowly interested in biology
Ds
very good expalnation
Sir human disease vali video bhi dal do please
  1. COURSE Principles of inheritance and variations Lesson 9 Test Cross and Its importance Dr. Praveen Kumar Agrawal M.Sc., Ph.D., CSIR NET (JRF). SRF, GATE 21Years of Pre-medical teaching experience


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  3. Test Cross Method to Determine the Genotypic Natue of an Individual The dominant phenotype may be homozygous (TT) or heterozygous (Tt). The genotype of such dominants can be determined with the help of a test cross. In a test cross, the offsprings with unknown genotypes are crossed with homozygous recessive double recessive (i.e., tt) parent. The resultant progeny is examined. By a test cross, all the possibilities occur in 1 1 ratio. Ifthe progeny has all dominant phenotypes then the individual with unknown genotypes would be homozygous dominant (i.e., TT). If the progeny has dominant and recessive phenotypes, in equal ratio, then the individual with unknown phenotype would be heterozygous dominant (i.e., Tt) Individual to AA Individual to be tested be tested A a Aa Aa Aa All dominant Two dominant Two recessive


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