Question

Suppose T is dominant to t. T confers tall plant height. In a cross between a parent of unknown genotype and a Tt individual, 50% of the progeny are tall. What is the genotype of the unknown parent?a. TTb. Ttc. impossible to telld. tt

Answer 1

D. tt

Because T is dominant and will always be expressed if it is present, if a TT plant or Tt plant were to cross it would give 100% y’all plants since each offspring would have a dominant T gene. The only way to have 50% tall and 50% not tall would be to mate with a homozygous recessive plant with a tt genotype.