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Andhra Pradesh SSC (Class 10) Heredity and Evolution — practice questions

Explore 28 free Heredity and Evolution questions in Andhra Pradesh SSC (Class 10) Science and Technology. Open each question or exercise to read its content, reference answers and available explanation.

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Heredity and Evolution questions and exercises with answers

Showing questions 1–28 of 28.

When a pure TALL pea plant (TT) is crossed with a pure DWARF pea plant (tt), the F1 generation will all be:Read the answer and worked solution →In a Mendel MONOHYBRID cross, the F2 generation shows the phenotype ratio of:Read the answer and worked solution →In a Mendel DIHYBRID cross (two pairs of traits), the F2 phenotype ratio is:Read the answer and worked solution →Humans have how many pairs of chromosomes in each somatic cell?Read the answer and worked solution →Mendel worked primarily with which organism?Read the answer and worked solution →Mendel's monohybrid F2 ratio is:Read the answer and worked solution →Human sex is determined by:Read the answer and worked solution →Female humans have which sex chromosome pair?Read the answer and worked solution →Homologous organs have:Read the answer and worked solution →The theory of natural selection was proposed by:Read the answer and worked solution →CLASS10 · Biology · Heredity — Spot the ErrorRead the answer and worked solution →CLASS10 · Biology · Heredity — True or FalseRead the answer and worked solution →Who is known as the Father of Genetics?Read the answer and worked solution →In Mendel's monohybrid cross, the phenotypic ratio in F₂ generation was:Read the answer and worked solution →The phenotypic ratio in F₂ of a dihybrid cross is:Read the answer and worked solution →How many pairs of chromosomes are there in a human somatic cell?Read the answer and worked solution →What is the genotype of a heterozygous tall pea plant?Read the answer and worked solution →Sex of a human child is determined by the chromosome contributed by:Read the answer and worked solution →Which of the following is an ACQUIRED trait, not an inherited one?Read the answer and worked solution →In a cross between two heterozygous tall pea plants (Tt × Tt), what fraction of the offspring will be pure dwarf?Read the answer and worked solution →Which pair of alleles correctly represents a homozygous condition?Read the answer and worked solution →Mendel's law of independent assortment applies to:Read the answer and worked solution →In a dihybrid cross with 9:3:3:1 ratio of offspring, what fraction shows both recessive traits?Read the answer and worked solution →Which of these is NOT possible for the offspring of a TT × tt cross?Read the answer and worked solution →Match the genotype to its phenotype (pea plant) (CBSE Cl 10)Read the answer and worked solution →Sort: inherited trait or acquired trait? (CBSE Cl 10)Read the answer and worked solution →Memory match: ratios from Mendel's experiments (CBSE Cl 10)Read the answer and worked solution →True or false on inheritance (CBSE Cl 10)Read the answer and worked solution →

Worked practice questions

When a pure TALL pea plant (TT) is crossed with a pure DWARF pea plant (tt), the F1 generation will all be:

  1. Tall, because T is dominant over t
  2. Dwarf, because t is dominant over T
  3. Half tall and half dwarf, by 50:50 ratio
  4. Medium height, exactly between tall and dwarf
Show answer and solution

Correct answer: A. Tall, because T is dominant over t

The F1 generation is all Tt (heterozygous). Since T is DOMINANT over t, all F1 plants are TALL. The recessive trait is masked but reappears in F2 in a 1:3 ratio (dwarf:tall).

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In a Mendel MONOHYBRID cross, the F2 generation shows the phenotype ratio of:

  1. 1 : 1 (equal in both forms)
  2. 9 : 3 : 3 : 1 (dihybrid pattern)
  3. 3 : 1 (dominant : recessive)
  4. 2 : 1 (heterozygous : homozygous)
Show answer and solution

Correct answer: C. 3 : 1 (dominant : recessive)

**The F2 phenotype ratio is 3 (dominant:** TT + Tt) : 1 (recessive: tt). **The genotype ratio is 1 TT :** 2 Tt : 1 tt. 9:3:3:1 is the dihybrid ratio, not monohybrid.

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In a Mendel DIHYBRID cross (two pairs of traits), the F2 phenotype ratio is:

  1. 3 : 1 monohybrid pattern, doubled
  2. 1 : 1 : 1 : 1 across four combinations
  3. 2 : 2 : 1 : 1 across the four offspring types
  4. 9 : 3 : 3 : 1 across four combinations
Show answer and solution

Correct answer: D. 9 : 3 : 3 : 1 across four combinations

A dihybrid cross (two contrasting traits at once) gives an F2 phenotype ratio of 9 : 3 : 3 : 1. This proves traits assort INDEPENDENTLY: each trait is inherited separately from the other.

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