Answer to Question #188670 in Biology for Ta;lor

Question

Rose plants usually have thorny stems. Bare stems are present in rose plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what is the expected outcome in percentages, of crossing two rose plants that are heterozygous for thorny stems? _________________________

Answer 1

Assume T - dominant allele, t - recessive allele. The crossing of two heterozygous rose plants is as follows:

Parents: Tt x Tt

Gametes: T, t x T, t

F1 offspring: TT : 2Tt : tt

From here, the percentages are 75 % thorny stems (TT and 2Tt) and 25 % bare stems (tt).

Answer: 75 % and 25 %