Problem: How can you predict the possible results of genetic crosses?
Data Table 1
Data Table 2
Data Table 3
Analyze and Conclude
1. Make a Punnet square for each of the crosses you modeled in Part 1, Part 2, and Part 3.
2. When you cross two homozygous parents, BB and bb, you get only one kind of offspring, Bb. The results agree with the marble model 100%.
3. 50 % of the offspring would be heterozygous and 50% would be homozygous if a homozygous and heterozygous are crossed. They don't agree with the marble model because in the marble model it shows 60% are homozygous and 40% are heterozygous.
4. There are three different kinds of offspring when two heterozyogous parents are crossed; BB 25%, bb 25% and Bb 50%. NO the results don't mach because in the model BB is 70% bB is 10% and bb is 20%.
5. The Punnett square is theoretical and shows perfect results. If you cross 100 times it would be more accurate than 10 times because there is more Data to calculate.
6. The Punnett square and the marble model have similarities and differences. The Punnett square and the marble model show the percentage of offspring.They both show which two parents were crossed. The Punnet square is easier to make and to see but it shows a theoretical outcome. The marble model takes longer but it shows real results. Both of these are useful in different situations depending on the needs of the researcher.
Data Table 1
Data Table 2
Data Table 3
Analyze and Conclude
1. Make a Punnet square for each of the crosses you modeled in Part 1, Part 2, and Part 3.
2. When you cross two homozygous parents, BB and bb, you get only one kind of offspring, Bb. The results agree with the marble model 100%.
3. 50 % of the offspring would be heterozygous and 50% would be homozygous if a homozygous and heterozygous are crossed. They don't agree with the marble model because in the marble model it shows 60% are homozygous and 40% are heterozygous.
4. There are three different kinds of offspring when two heterozyogous parents are crossed; BB 25%, bb 25% and Bb 50%. NO the results don't mach because in the model BB is 70% bB is 10% and bb is 20%.
5. The Punnett square is theoretical and shows perfect results. If you cross 100 times it would be more accurate than 10 times because there is more Data to calculate.
6. The Punnett square and the marble model have similarities and differences. The Punnett square and the marble model show the percentage of offspring.They both show which two parents were crossed. The Punnet square is easier to make and to see but it shows a theoretical outcome. The marble model takes longer but it shows real results. Both of these are useful in different situations depending on the needs of the researcher.
In number 5 you mention that the Punnett square is theoretical and shows perfect results. Can you explain this more? It seems that the Punnett square did not always show perfectly what the results would be in the true crossing of marbles. Wasn't much of it left to chance?
ReplyDeleteGood job overall, labels on your tables would have been helpful to know the crosses.