It takes very long time for pineapple plants to
produce flowers. Which combination of hormones
can be applied to artificially induce flowering in
pineapple plants throughout the year to increase
yield?
In Antirrhinum (Snapdragon), a red flower was
crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers.
Choose the incorrect statement from the following :
Explanation:
The cross red x white in Antirrhinum shows incomplete dominance, yielding pink in F1. In F2, segregation of alleles gives 1 red : 2 pink : 1 white, confirming incomplete dominance and that the Law of Segregation does apply (gametes carry alleles, and they segregate during formation). Therefore statement 1 is incorrect. Statements 2, 3, and 4 are consistent with NCERT: ratio 1/4 red, 1/2 pink, 1/4 white; pink in F1 results from incomplete dominance; and the experiment does not follow complete dominance.
🧠 Did You Know?
In incomplete dominance, heterozygotes show a third phenotype (pink) distinct from either homozygote (red or white).
💡 NCERT Memory Line:
Antirrhinum shows incomplete dominance; F2 phenotype ratio is 1:2:1 (red:pink:white) due to segregation of alleles.
