In tomatoes, red fruit color dominates over yellow. What offspring can be obtained by crossing heterozygous tomato plants

In tomatoes, red fruit color dominates over yellow. What offspring can be obtained by crossing heterozygous tomato plants with red fruits and plants with yellow fruits?

The dominant feature – we denote the red color by A
The recessive trait-yellow color is denoted by a.
The main rule is that the dominant trait always suppresses the recessive one.
A heterozygous fetus contains both dominant and recessive genes: Aa.
When crossing Aa with a red fruit, 2 cases are possible:
1) Aa + AA. Next, we will compose all possible combinations of gametes after crossing, there are four of them: AA, aA, aA, AA. Since the red trait is dominant (suppressive), it means that in this case 100% of the offspring will be red.
2) Aa + Aa. Possible gametes: AA, Aa, aa, aA. Three out of four turned out to be red, one (aa) yellow. This means that in this case the probability of getting the offspring of red tomatoes is 75%, yellow ones-25%.
Then we cross the heterozygous fruit with the yellow one:
Aa + aa. 4 possible options: Aa, Aa, aa, aa. Here the probability of red fruits is 50% and the probability of getting yellow offspring of tomatoes is 50%.



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