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Biology · PRINCIPLES OF INHERITANCE AND VARIATION

हिन्दी

In Mendelian genetics, the term 'monohybrid cross' refers to a cross between two plants that differ in:

  1. A single pair of alleles controlling one character
  2. Two pairs of alleles controlling two independent characters
  3. Chromosomal number and ploidy level
  4. Mode of pollination only

Correct answer · Option 1

A single pair of alleles controlling one character

Explanation

A monohybrid cross is a cross between parents that are heterozygous for genes controlling a single character (e.g., height, controlled by alleles \( T \) and \( t \)).

Related questions

A cross between a true-breeding tall pea plant (\( TT \)) and a true-breeding dwarf pea plant (\( tt \)) yielded \( F_1 \) plants, which were then self-pollinated to produce 1200 \( F_2 \) plants. How many of these \( F_2 \) plants are expected to be heterozygous tall?→In pea seeds, starch synthesis is controlled by a single gene with alleles \( B \) and \( b \). Considering starch grain size as the phenotype, the alleles show (i)_________, whereas considering seed shape (round vs. wrinkled) as the phenotype, allele \( B \) shows (ii)_________.→Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).\n Assertion (A): In a monohybrid cross of Antirrhinum majus (snapdragon) between true-breeding red-flowered and white-flowered plants, the phenotypic and genotypic ratios in the \( F_2 \) generation are identical (1:2:1).\n Reason (R): The allele for red flower colour is completely dominant over the allele for white flower colour, allowing heterozygous individuals to express a blended phenotype.\nIn the light of the above statements, choose the correct answer from the options given below:→Mendel selected 14 true-breeding pea plant varieties as pairs. Which of the following pairs correctly matches the character with its dominant and recessive traits?→
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