Drosophila Melanomas: Predicting Traits Lab Report The purpose of this study is to get an accurate look on how genetics work, and to practice determining the different traits Within the species. D. Melanomas are useful because they are easily cultured and they reproduce very quickly. The eye color data supports past genetics problems because it can be predicted, and used in Pungent squares to aid in the prediction.Fifth P generation consists off purebred red eyed fly(dominant) and a purebred sepia eyed fly (recessive), hen the Fl generation will be heterozygous and produce an IF generation with mostly red eyed, but some sepia eyed flies. Prediction: Since the P generation and its Fl offspring is red eyed, and the Fl generation had some heterozygous flies, can be predicted that the eye color is an autocross trait. Also, certain colors are not restricted to a certain gender, Red eye color is most likely dominant because the P generation was a purebred red, and a purebred sepia fly, and their offspring was all heterozygous red.Pungent Squares: P Generation: Genotypes Ratio- Phenotypes Ratio VI Generation: Genotypes Ratio- 1:2:1 Phenotypes Ratio- The percentage counts of all three table types are very similar, though the averages were different because the different lab groups had different amounts f flies.
The number of red eyed flies were always over double the amount of sepia colored ones. This proves that red is dominant. The total number Of flies for all classes was 2257, 1802 for red eyed 455 for sepia eyed.The group (Period 7 group 7) had 184 flies, 162 for red eyed, 22 for sepia. The group number Of red flies (Period 7 group 7) had more flies and more red eyed than any other group in the class, and all of the other classes.
Compared to the class data, the group percentages were similar. The data is very similar to the Pungent Squares prediction because red is finitely dominant, and sepia amount is about 1/4 of the red.Conclusion: The purpose of this activity was to learn about the passing on of traits, how genetics work between different generations, and to practice determining traits for future generations, The parent eye color phenotypes were red (wild type) and sepia. It was initially predicted that the IF generations eye color would be mostly red but have some sepia. The results were 1347 more red eye colored flies than sepia for all of the classes.
The class data ratio was about 156:37, and the redirected class data ratio was based on the Pungent square.This ratio can be used to determine the parent and offspring genotypes because if it is known that the VI generation eye color was red, and their offspring had some sepia eyes, then the Fl generation must have had some heterozygous flies. Using this information the offspring genotypes can be predicted with a Pungent square.
Mender’s principles of dominance and segregation relate to this lab. This lab could be improved or changed by also looking at the sex Of the flies to help With determining phenotypes.