Home › Tamil Nadu SSLC (Class 10) › Biology › Genetics › In Mendel's monohybrid cross between a pure tall…
In Mendel's monohybrid cross between a pure tall and a pure dwarf pea plant, what is the phenotypic ratio observed in the F2 generation?
A1 tall : 1 dwarf
B9 tall : 7 dwarf
C3 tall : 1 dwarf
D2 tall : 1 dwarf
Answer & Solution
Correct answer: C. 3 tall : 1 dwarf
1. Cross parents TT (tall) and tt (dwarf); all F1 are Tt and tall.
2. Self the F1: Tt x Tt.
3. Punnett square gives 1 TT : 2 Tt : 1 tt.
4. TT and Tt both look tall (3), tt is dwarf (1).
5. So the phenotypic ratio is 3 tall : 1 dwarf, which is option C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Monohybrid Cross", p.269_
Related questions
Which one of these is found in human males only?Sickle cell anaemia results from a change in the nucleotide sequence of a single gene. ThiThe gain or loss of one or more chromosomes from a normal set, as seen in Trisomy and MonoDown's syndrome in humans is caused by the presence of an extra copy of which chromosome?In the context of human sex chromosomes, why is the human female described as homogametic?If an egg carrying X fuses with a sperm carrying Y, what will be the sex chromosome make-uIn humans, the sex of a child is determined by the type of sex chromosome carried by whichWhich enzyme binds at the origin of replication and separates the two strands of the DNA m