Answer:
The probability of a yellow seed (YY) plant forming a Y gamete is 100% because the principle of segregation - an allele from each pair of genes goes to a gamete; it only has "Y" alleles.
Step-by-step explanation:
Mendel's first law, also called the Segregation Law, says that each characteristic of living beings is conditioned by a pair of alleles that separate in the formation of gametes. To reach this conclusion, Mendel carried out a series of experiments with peas and was able to apply mathematics in his studies.
According to this law, we can say that the probability of a yellow seed (YY) plant forming a Y gamete is 100% because the principle of segregation - an allele from each pair of genes goes to a gamete.