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Punnett Squares: Understanding Codominance and Incomplete Dominance in Genetics, Study notes of Genetics

University of Central Missouri (UCM)Genetics

An explanation of genetics concepts such as genes, alleles, genotype, phenotype, homozygous, heterozygous, codominance, and incomplete dominance. It includes examples using punnett squares to determine the genotypes and phenotypes of offspring from different crosses. The document also covers the significance of blood types in genetics.

What you will learn

  • What is the difference between a gene and an allele?
  • What is the difference between a homozygous and heterozygous genotype?
  • What is the significance of codominance in genetics?

Typology: Study notes

2021/2022

Uploaded on 09/12/2022

marphy
marphy 🇺🇸

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Name: ______________________________ Date: _____________________
Punnett Squares: Codominance and Incomplete Dominance
What is carried within DNA? ______________________________________________________
How is this information carried? ___________________________________________________
Define gene ___________________________________________________________________
Define allele ___________________________________________________________________
Define genotype ________________________________________________________________
What does it mean if a gene has been expressed? _____________________________________
______________________________________________________________________________
What does unexpressed mean? ___________________________________________________
Define phenotype _______________________________________________________________
Define homozygous: ____________________________________________________________
Define heterozygous: ____________________________________________________________
Complete the table using the information below:
What does it mean if genes are codominant? _________________________________________
What is an example of genes that are codominant? ____________________________________
1. A person with genotype IAIA has blood type ______
2. A person with genotype IAi has blood type ______
3. A person with genotype IBIB has blood type ______
4. A person with genotype IBi has blood type ______
5. A person with genotype ii has blood type ______
6. A person with genotype IAIB has blood type ______
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Download Punnett Squares: Understanding Codominance and Incomplete Dominance in Genetics and more Study notes Genetics in PDF only on Docsity!

Name: ______________________________ Date: _____________________

Punnett Squares: Codominance and Incomplete Dominance

What is carried within DNA? ______________________________________________________

How is this information carried? ___________________________________________________

Define gene ___________________________________________________________________

Define allele ___________________________________________________________________

Define genotype ________________________________________________________________

What does it mean if a gene has been expressed? _____________________________________

What does unexpressed mean? ___________________________________________________

Define phenotype _______________________________________________________________

Define homozygous : ____________________________________________________________

Define heterozygous : ____________________________________________________________

Complete the table using the information below:

What does it mean if genes are codominant? _________________________________________

What is an example of genes that are codominant? ____________________________________

  1. A person with genotype IAIA^ has blood type ______
  2. A person with genotype IAi has blood type ______
  3. A person with genotype IBIB^ has blood type ______
  4. A person with genotype IBi has blood type ______
  5. A person with genotype ii has blood type ______
  6. A person with genotype IAIB^ has blood type ______

IAi ( ♂ ) x IAIA^ ( ♀ ) IAi ( ♂ ) x IBi ( ♀ ) IAIA^ ( ♂ ) x IAIB^ ( ♀ ) IAi ( ♂ ) x IBIB^ ( ♀ )

IBi ( ♂ ) x IBi ( ♀ ) ii ( ♂ ) x IAIB^ ( ♀ ) IAIA^ ( ♂ ) x ii ( ♀ ) IAi ( ♂ ) x IAIB^ ( ♀ )

rr ( ♂ ) x Rr ( ♀ )

  1. What percentage of offspring will be pink?

Rr ( ♂ ) x rr ( ♀ )

  1. What percentage of offspring will be white?

Rr ( ♂ ) x Rr ( ♀ )

  1. How many phenotypes would be seen in the offspring?

RR ( ♂ ) x Rr ( ♀ )

  1. What percentage of offspring will be red?

Why is blood type O recessive? ____________________________________________________

Why are blood type A and blood type B codominant? __________________________________

How would you define incomplete dominance? _______________________________________

What type of phenotype does incomplete dominance produce? __________________________

  1. A species of flowers exhibits incomplete dominance between the allele for red flowers and the allele for white flowers. If a plant homozygous for red flowers is crossed with a plant that is homozygous for white flowers, what percentage of offspring will have pink flowers? _____________
  2. A species of flowers exhibits incomplete dominance between the allele for red flowers and the allele for white flowers. If two heterozygous, pink plants are crossed, what percentage of each color of flower will appear in the offspring?

% red _______ % pink _______ % white _______