monohybrid

Examples of monohybrid in the following topics:

• The Punnett Square Approach for a Monohybrid Cross

  • A Punnett square applies the rules of probability to predict the possible outcomes of a monohybrid cross and their expected frequencies.
  • When fertilization occurs between two true-breeding parents that differ in only one characteristic, the process is called a monohybrid cross, and the resulting offspring are monohybrids.
  • Mendel performed seven monohybrid crosses involving contrasting traits for each characteristic.
  • To demonstrate a monohybrid cross, consider the case of true-breeding pea plants with yellow versus green pea seeds.
  • For a monohybrid cross of two true-breeding parents, each parent contributes one type of allele.

• Mendel's Law of Independent Assortment

  • Because of independent assortment and dominance, the 9:3:3:1 dihybrid phenotypic ratio can be collapsed into two 3:1 ratios, characteristic of any monohybrid cross that follows a dominant and recessive pattern.
  • To prepare a forked-line diagram for a cross between F1 heterozygotes resulting from a cross between AABBCC and aabbcc parents, we first create rows equal to the number of genes being considered and then segregate the alleles in each row on forked lines according to the probabilities for individual monohybrid crosses.

• Mendel's Law of Segregation

  • For the F2 generation of a monohybrid cross, the following three possible combinations of genotypes could result: homozygous dominant, heterozygous, or homozygous recessive.

• Alternatives to Dominance and Recessiveness

  • However, the 1:2:1 genotypic ratio characteristic of a Mendelian monohybrid cross still applies.

• Mendel's Laws of Heredity

  • If it is inevitable that round seeds must always be yellow and wrinkled seeds must be green, then he would have expected that this would produce a typical monohybrid cross: 75 percent round-yellow; 25 percent wrinkled-green.