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The Work of Gregor Mendel. Section 11–1. GENETICS. The scientific study of heredity is called . Genetics. Gregor Mendel’s peas. b. When pollen fertilizes an egg cell, a seed for a new plant is formed. c. Pea plants normally reproduce by self-pollination.

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  • The scientific study of heredity is called .
  • Genetics
gregor mendel s peas
Gregor Mendel’s peas.

b. When pollen fertilizes an egg cell, a seed for a new plant is formed.

c. Pea plants normally reproduce by self-pollination.

What does it mean when pea plants are described as being true-breeding?

If the plants are allowed to self-pollinate, they would produce offspring identical to themselves.

mendel the monk
Mendel the Monk
  • To perform his experiments, how did Mendel prevent pea flowers from self-pollinating and control their cross-pollination?

He cut away the pollen-bearing male parts of a flower and dusted that flower with pollen from another plant.

  • Traits
  • Specific characteristics that vary from one individual to another.
  • Hybrid
  • The offspring of crosses between parents with different traits.
  • Genes
  • Chemical factors that determine traits
  • Alleles
  • The different forms of a gene
principle of dominance
Principle of Dominance
  • State the principle of dominance.
  • Some alleles are dominant and others are recessive.
dominance vs recessive
Dominance vs. Recessive
  • Is the following sentence true or false?
  • An organism with a recessive allele for aparticular form of a trait will always exhibit that form.
  • False
dominance vs recessive1
Dominance vs. Recessive
  • Circle the letters of the traits controlled by dominant alleles in Mendel’s pea plants.
  • a. tall
  • c. yellow
mendel s experiment
Mendel’s Experiment

How did Mendel find out whether the recessive alleles were still present in theF1 plants?

  • He allowed the F1 plants to produce an F2 generation by self-pollination.
mendel s experiment1
Mendel’s Experiment
  • About one fourth of the F2 plants from Mendel’s F1 crosses showed the trait controlled by the allele.
mendel s experiment2
Mendel’s Experiment
  • Circle the letter of each sentence that is true about Mendel’s explanation of the results from his F1 cross.
  • Mendel assumed that a dominant allele had masked the corresponding recessiveallele in the F1 generation.

d. At some point, the allele for shortness was segregated, or separated, from the allelefor tallness.

  • What are gametes?
  • They are the sex cells.
segregation of alleles
Segregation of Alleles

In the diagram above, the dominant allele is represented by T and the

recessive allele is represented by t .