Question

based on observational evidence, variations in the color of flamingos appears to be determined by their diet, an not their genes. Describe the steps of an investigation to provide evidence to support or refute this hypothesis.

Answer 1

In order to make a proper investigation using the scientific method we have to follow the following statements.

• Create three or more groups of flamingos. One control group were the flamingos will be fed by their occasional diet. A second group with a diet with no artificial or natural dye, as β-Carotene, which is high present in seaweeds. The third group will have a diet with a high amount of β-Carotene.
• The color of the groups will be analyzed to see the changing of pigmentation by time. If the group which is fed by B-Carotene increases the pigmentation, it might indicate a diet factor.

• As counterproof, a sample of DNA of the groups has to be taken. If is there any pattern between the groups of no-colored flamingos and a pattern of colored ones. It can indicate a genetic factor. If not, the diet can be responsible for it.

Answer 2

It is possible to carry out genetic crosses in order to observe the phenotypic proportion in offspring and thus confirm genetic inheritance.

• Genetic inheritance can be traced by observing the proportion of offspring in a given cross.

• In diploid organisms, individuals receive two alleles (or gene forms) for a given gene locus.

• In complete dominance, the dominant allele completely masks the expression of the recessive allele in heterozygous individuals.

In conclusion, it is possible to carry out genetic crosses in order to observe the phenotypic proportion in offspring and thus confirm genetic inheritance.

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