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MDCAT Biology QUESTION #11276
Question 1
A heterozygous tall plant (Tt) is crossed with a homozygous short plant (tt). What is the expected phenotypic ratio in the offspring?
  • All tall
  • All short
  • 1 tall : 1 short✔️
  • 3 tall : 1 short
Correct Answer Explanation
This is a test cross. The Tt parent produces T and t gametes (50% each), while the tt parent produces only t gametes. Offspring genotypes: 50% Tt (tall) and 50% tt (short). Phenotypic ratio = $1$ tall : $1$ short.