•Offspring of the P generation were called the F2 generation.

Question

BlackTom AI · Accepted Answer

The designation "F2" refers to the second filial generation, so it does not name the immediate offspring of the parental (P) generation.

1. Relevant knowledge points and concepts:
- P generation: the original parent individuals in a genetic cross.
- F1 generation: the first filial generation, the direct offspring of the P cross.
- F2 generation: the second filial generation, the offspring produced by crossing or selfing individuals of the F1 generation.
- Mendelian crosses and Punnett squares show how alleles segregate across generations.

2. Step-by-step reasoning:
- Start with a simple Mendelian example: cross two true-breeding parents (P generation). Let one parent be homozygous dominant (AA) and the other homozygous recessive (aa).
- Offspring of this P × P cross are all heterozygous Aa; these immediate offspring are the F1 generation.
- If F1 individuals (Aa) are crossed with each other (Aa × Aa) or self-fertilized, their offspring form the F2 generation.

3. Calculations and intermediate steps (Punnett square):
- P cross: AA × aa => all F1: Aa, Aa, Aa, Aa (100% Aa).
- F1 cross: Aa × Aa. Punnett square:
  - Gametes: A and a from each parent.
  - Offspring genotypes: AA, Aa, aA, aa → simplifies to 1 AA : 2 Aa : 1 aa.
  - Phenotypic ratio (if A is dominant): 3 dominant : 1 recessive.
- These AA, Aa, aa offspring are the F2 individuals — they arise from F1 × F1, not directly from P.

4. Why the correct answer is correct:
- Because "offspring of the P generation" are the F1 generation, the statement claiming they are called F2 is incorrect.

5. Why the other option is incorrect:
- The "True" option would assert that P offspring are F2, which conflicts with standard genetic nomenclature (F1 = direct offspring of P).

6. Conclusion:
- Therefore, the correct response is False, matching the provided answer.

•Offspring of the P generation were called the F2 generation.判断题

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