Remember for a di hybrid cross with two completely heterozygous parents, the phenotypic ratio will always be 9:3:3:1
9 will always display both dominant traits, black and rough hair. 3 will display black hair and smooth hair and 3 will display not black hair and rough hair and 1 will display both receive traits
A- Temperature.
Hope this helps!<span />
<span>a medicine that inhibits the growth of or destroys microorganisms</span>
They begin to form about 3.8 billion years ago
