In tomatoes, round fruits dominate over pear-shaped. With what form of fruits will the hybrids

| April 11, 2021 | education

In tomatoes, round fruits dominate over pear-shaped. With what form of fruits will the hybrids be if you cross the heterozygous round-fruited form of tomatoes with the form with pear-shaped fruits? Heterozygous round-shaped forms among themselves.

Let A be a round shape of tomatoes, and a pear-shaped one.
1) When crossing heterozygous tomatoes (Aa) with pear-shaped (aa) hybrids will also be Aa – round and aa – pear-shaped, because one individual produces gametes A and a, and the other only a.
2) When crossing 2 heterozygous round tomatoes (Aa) and a female and a male individual form 2 varieties of gametes – A and a, so the hybrids will be as follows: 25% AA – round; 50% Aa – round, 25% – pear-shaped. That is, in the offspring according to the phenotype, 75% are round, 25 percent are pear-shaped.



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