Q1
What does the Law of Dominance state?
ADominant allele masks the recessive allele
BBoth alleles express equally always
CRecessive always dominates
DNo masking occurs
ICSEClass 10 (ICSE)BiologyCh 2 · Topic 2
Practice and Revision - Genetics - Some Basic Fundamentals
Let us practise and revise what we learned about genetics - some basic fundamentals. Genetics studies heredity and variation, with Mendel's
Core concept
Mendel's Law of Dominance states that when two contrasting alleles are present, one (dominant) masks the expression of the other (recessive).
How it works
Mendel's Law of Segregation states that allele pairs separate during gamete formation, so each gamete carries only one allele for each trait.
Why it matters
A genotype is the genetic makeup of an organism (like Tt), while phenotype is the physical expression of that genotype (like tall).
Key detail
Punnett squares are used to predict the probability of offspring genotypes and phenotypes from a genetic cross between parents.
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Quick notes
• Law of Dominance: dominant allele masks recessive.
• Law of Segregation: allele pairs separate in gametes.
• Each gamete carries one allele per trait.
• Genotype: genetic makeup (e.g., Tt).
• Phenotype: physical expression (e.g., tall).
• Punnett squares predict offspring outcomes.
• They show genotype and phenotype probabilities.
• These are foundational genetics concepts.