Podcast
Questions and Answers
What distinguishes co-dominance from complete dominance in genetic expression?
What distinguishes co-dominance from complete dominance in genetic expression?
Which of the following genotypes results in a roan phenotype in cattle?
Which of the following genotypes results in a roan phenotype in cattle?
What is the phenotypic ratio observed in the F2 generation of co-dominant cattle offspring?
What is the phenotypic ratio observed in the F2 generation of co-dominant cattle offspring?
In co-dominance, how would the offspring inherit their traits if one parent was RR and the other was WW?
In co-dominance, how would the offspring inherit their traits if one parent was RR and the other was WW?
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Which term best describes the alleles R and W in the context of co-dominance?
Which term best describes the alleles R and W in the context of co-dominance?
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Study Notes
Co-dominance
- Co-dominance is a type of inheritance where both alleles of a gene pair are fully expressed in the heterozygote, resulting in a phenotype that is neither dominant nor recessive.
- In co-dominance, both alleles are expressed equally in the hybrid, unlike dominance where one is expressed over the other.
- An example of co-dominance is seen in the different coat colours such as: red, white, and roan.
- In this example, the alleles for red (R) and white (W) are co-dominant.
- The possible genotypes are RR (red), RW (roan), and WW (white)
- A cross between a red cow (RR) and a white cow (WW) produces roan offspring (RW).
- The phenotypic ratio (observed traits) in the F2 generation when crossing two roan cows (RW x RW) is 1 red:2 roan:1 white
- The genotypic ratio (genetic makeup) in the F2 generation when crossing two roan cows (RW x RW) is 1RR:2RW:1WW.
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Description
This quiz explores the concept of co-dominance in genetics, where both alleles are fully expressed in a heterozygote. You'll learn about examples, genotype and phenotype ratios, and the inheritance patterns of co-dominant traits, such as coat colors in cattle. Test your understanding of this important genetic principle.
