Suppose that the dominant, true-breeding parent was accidently self-pollinated instead of crossed with the true-breeding recessive parent. How would this affect the phenotypes of the F1 and F2 generation?

Since the parent that self-pollinated only carries dominant alleles, the phenotypes for the next generations would also only carry the dominant alleles, meaning that whatever colour the self-breeding parent was, is the same colour the next generations would be, as theirs no recessive genes being passed on!

I hope that makes sense!

Morula

Explanation:

The general meaning of  blastocyst is a hollow cavity and thus it is the correct term which defines a hollow cellular mass that develops with the first week of fertilization. While morula is the stage in embryogenesis that comes before the blastocyst stage but at this stage there are 16 undifferentiated solid cells  therefore Morula is incorrect choice for this answer.

Fetus is  an advanced stage of embryo and thus it is also incorrect.  

Placenta is a tube which connect the fetus with the mother for exchange of food and nutrition. Thus it is also incorrect