Alleles and Inherited Traits

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Course Outline

  1. Alleles and Inheritance
  2. Homozygous and Heterozygous States
  3. Dominant and Recessive Traits
  4. Genotype and Phenotype
  5. Punnett Squares

1. Alleles and Inheritance

Key Concepts & Definitions

  • Allele : A version of a gene found at a particular position on a chromosome.

★ Must-know

  • An individual inherits two alleles for a gene, with one allele coming from each parent.

Further detail

  • Alleles help determine which eye-colour trait an individual obtains when the parents have different eye colours, such as blue and brown.

Memory Hook

Two parental alleles meeting at the same chromosome position

2. Homozygous and Heterozygous States

Key Concepts & Definitions

  • Homozygous : When the two alleles are the same.
  • Heterozygous : When the two alleles are different.

Essential Points

📌 Homozygous and heterozygous describe whether the two alleles for a trait are the same or different, respectively.

Memory Hook

Homozygous means same; heterozygous means different

3. Dominant and Recessive Traits

Key Concepts & Definitions

  • Dominant Trait : Needs only one copy of an allele to be visible in an individual's appearance.
  • Recessive Trait : A trait that is dominated by a dominant trait.
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Aperçu du QCM

1. What is an allele?

2. How many alleles for a gene does an individual typically inherit, and how are they obtained?

3. An individual has two identical alleles for a particular trait. What term describes this genetic state?

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Aperçu des flashcards

What is an allele in genetics?

A version of a gene at a specific chromosome position.

How many alleles does an individual inherit for each gene?

Two alleles, one from each parent.

What do alleles determine in eye colour inheritance?

Which eye-colour trait an individual obtains.

When is an individual homozygous for a trait?

When the two alleles are the same.

When is an individual heterozygous for a trait?

When the two alleles are different.

What do homozygous and heterozygous describe about alleles?

Whether the two alleles for a trait are the same or different.

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Que contient la fiche de révision sur Alleles and Inherited Traits ?

La fiche de révision couvre les notions essentielles de Alleles and Inherited Traits. Elle est structurée par thématiques pour faciliter l'apprentissage et la mémorisation, avec des définitions clés, des explications et des synthèses.

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