Question

In Hibiscus flower, red colour is dominant over white colour. When heterozygous red colour flowers were crossed with white colour flowers, 192 offsprings were produced. Exact Mendelian ratio was obtained. Then the number of phenotype ratio between red and white flowers in F1 is

• A. 64:128
• B. 96:96
• C. 128:64
• D. 192:0

Hint:

For monohybrid cross of heterozygous dominant with recessive, remember the genotype ratio is 1:1 and phenotype ratio is the same. Always double-check total offspring and apply fraction to find actual numbers.

Answer 1

The Correct Option is C

Hibiscus exhibits simple Mendelian inheritance for flower colour. Let red (R) be dominant and white (r) recessive. Crossing heterozygous red (Rr) with white (rr): Gametes: Rr × rr → offspring genotypes: Rr and rr in 1:1 ratio. Phenotype ratio = Red : White = 1:1. Total offspring = 192. Red flowers = 192 × 1/3? Wait carefully: 1:1 ratio means half-half. So Red = 192 × 1/2 = 96, White = 192 × 1/2 = 96. Thus correct phenotype ratio = 96:96. (Correcting counting; Option 2)