Let’s say Iromi’s gene is A, and Shiwao’s gene is a. This is a cross of two pure lines of one allele.
Gamete A, which is one of the gametes AA of Iromi, and gamete a, which is one of the gametes aa of Shiwao, combine, and a child (Aa) is born.
At that time, from such a combination all the children born have gene Aa and the children become round like Iromi, because gene A is dominant to gene a.
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