Traits, Genes, and Alleles Notes - PowerPoint PPT Presentation

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Traits, Genes, and Alleles Notes

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Traits, Genes, and Alleles Notes 3a. Predict the probable outcome of phenotypes in a genetic cross from the genotypes of the parents and mode of inheritance ... – PowerPoint PPT presentation

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Title: Traits, Genes, and Alleles Notes


1
Traits, Genes, and Alleles Notes
  • 3a. Predict the probable outcome of phenotypes
    in a genetic cross from the genotypes of the
    parents and mode of inheritance (autosomal or
    x-linked, dominant or recessive).

2
Objectives
  • Explain how there can be many versions of one
    gene.
  • Describe how genes influence the development of
    traits.

3
Vocabulary
  • Gene
  • Allele
  • Homozygous
  • Heterozygous
  • Genotype
  • Phenotype
  • Dominant
  • Recessive

4
  • The same gene can have many versions.

5
Gene
  • Specific region of DNA that codes for a
    particular protein.

6
Allele
  • Alternative forms of a gene that occur at a
    specific place on a chromosome.

7
Homozygous
  • Having two of the same alleles for a given gene
    on homologous chromosomes.

8
Heterozygous
  • Having two different alleles for a given gene on
    homologous chromosomes.

9
  • Genes influence the development of traits.

10
Genotype
  • Genetic makeup of a specific set of genes.

11
Phenotype
  • Physical characteristics, or traits, of an
    individual organism.

12
Dominant
  • Allele that is expressed when two different
    alleles are present in an organisms genotype.

13
Recessive
  • Allele that is not expressed unless two copies
    are present in an organisms genotype.
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