Answer :
In the context of genetics, understanding types of dominance and alleles, here's how you can approach the question:
6.2.1 Name and describe the type of dominance shown by cross:
When discussing genetic crosses, dominance refers to how the alleles interact in determining the phenotype. There are three primary types of dominance:
- Complete Dominance: One allele completely masks the presence of another.
- Incomplete Dominance: Neither allele completely dominates, resulting in a blend of both traits in the phenotype.
- Codominance: Both alleles are fully expressed, resulting in offspring with a phenotype that shows both traits.
To answer the question on the type of dominance, you would need the details from cross 4. Again, it's important to check if it indicates a scenario where one of these types fits based on phenotype outcomes. Without specific data from cross 4, it can't be pinpointed here.
6.2.2 Which shell colour is controlled by the recessive allele?
Typically, the recessive allele is the one that does not produce a visible effect in the organism's phenotype unless there are two copies. If the context provides specific shell colors, look for the color that appears in fewer circumstances (for example, only when both alleles are similar and recessive).
6.2.3 Use the information in the table to support your answer to QUESTION 6.2.2:
To support your answer, you would check the table for patterns showing when the recessive shell color appears. For example, if the recessive shell color appears only in individuals with a specific allele combination (e.g., aa), that supports it being the recessive color.
Based on genetic tables, typically if a certain color is less prevalent or appears only when two recessive alleles combine, that’s your recessive phenotype support.
