Biology Inheritance / Variation & Genetics UHS 2023
PMDC Verified Question 31 of 94
According to Mendel Law of Segregation, the one individual out of four in \(F_2\) generation had phenotype that failed to express in ____ generation.
A
\(F_1\)
B
\(F_2\)
C
\(F_3\)
D
P1
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: \(F_1\)
Concept:

Mendel observed that certain traits could disappear in one generation and reappear in the next, leading to the concept of dominant and recessive alleles.

Solution:

  • When true-breeding parents (P1) are crossed, all offspring in the \(F_1\) generation display the dominant phenotype, effectively hiding the recessive trait.
  • According to the Law of Segregation, these hidden recessive alleles separate when the \(F_1\) generation is self-crossed.
  • This allows the recessive phenotype to reappear in the \(F_2\) generation at a ratio of 1 out of 4 (25%).


Why other options are incorrect:

  • The trait is visibly expressed in the P1 (homozygous recessive parent) and the \(F_2\) generations. It is specifically masked in the \(F_1\) heterozygotes.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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