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A geneticist was studying coat colour in a herd of Shorthorn cattle - HSC - SSCE Biology - Question 14 - 2005 - Paper 1
Question 14
A geneticist was studying coat colour in a herd of Shorthorn cattle. She performed the following cross: Red coat × White coat The results of the cross are shown in... show full transcript
Worked Solution & Example Answer:A geneticist was studying coat colour in a herd of Shorthorn cattle - HSC - SSCE Biology - Question 14 - 2005 - Paper 1
Step 1
The roan coat colour was the result of which type of inheritance?
Answer
To determine the type of inheritance for the roan coat colour, we can analyze the data provided in the table. Both red and white coats are not present in the offspring, suggesting that they are not strictly a dominant phenotype. Instead, the presence of the roan coat indicates that both alleles contribute to the phenotype in a way that neither allele completely masks the other. This pattern describes co-dominance, where both red and white traits are expressed in the heterozygous offspring.
Hence, the answer to the given question is (A) Co-dominance.