An extraterrestrial planet has organisms that reproduce with DNA the same way as organisms on Earth. A common organism dwelling on this planet have eyes that are either triangular or round. Triangular eyes (T) are dominant to round eyes (t). A Punnett square should be made to predict the offspring of two of these extraterrestrials with the genotypes TT and Tt.
What is the probability that an offspring would have triangular eyes?
Based on the given information, we know that triangular eyes (T) are dominant to round eyes (t). This means that if an organism has at least one T allele, they will have triangular eyes.
The genotypes of the two parents are TT and Tt. To create a Punnett square, we need to list the possible combinations of alleles that can be passed on to the offspring.
For the first parent with genotype TT, there is only one possible combination of alleles: T and T. This is because both alleles are the same.
For the second parent with genotype Tt, there are two possible combinations of alleles: T and t. This is because this organism has one T allele and one t allele.
Now we can create a Punnett square using these allele combinations:
| T | T |
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| T | TT | TT |
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| t | Tt | Tt |
From the Punnett square, we can see that there are 3 out of 4 possible combinations that result in an offspring having the triangular eye phenotype (TT, Tt, Tt). Therefore, the probability that an offspring would have triangular eyes is 3/4 or 0.75.