The diagram below shows a monohybrid cross for plant height where T is the allele for tallness, and t for shortness. Which of the following…

JAMB Biology 2024 271 views
Source: JAMB · 2024

The diagram below shows a monohybrid cross for plant height where T is the allele for tallness, and t for shortness. Which of the following statements about this cross is not true?
Parents TT x tt
————-↓
Offspring Tt

  1. Both parents are homozygotes
  2. All the offspring are short ✓
  3. All the offspring are heterozygotes
  4. The parents are hybrid
Explanation

Cross TT × tt. Every TT parent gives T and every tt parent gives t. So all offspring are Tt.

Tt has one tall allele, T. T is dominant, so all offspring are tall, not short. That makes the statement that all offspring are short the false one.

The other statements are true. TT and tt are homozygous, and Tt offspring are heterozygous.

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