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Which of the following crosses can never result in a recessive phenotype?(a) Tt Pp X Tt Pp(b) TT Pp X tt pp(c) tt pp X TT PP(d) tt pp X Tt PpThe question was posed to me in an international level competition.This intriguing question originated from Numerical Problems topic in division Mendelian Genetics of Cytogenetics

Answer»

Correct choice is (C) tt pp X TT PP

For explanation I WOULD say: In case of this cross although one is homozygous recessive the other is homozygous dominant, so all the PROGENY will be heterozygous EXPRESSING the dominant trait. In case of TT Pp X tt pp the recessive trait can be seen in case of P locus.



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