When true breeding red and white flowering plants were crossed, all pink offsprings were produced. When these pink flowered plants were self crossed, the percent of pink flowering offsprings would be
Correct answer: B. 50%
- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation
When true breeding red (RR) and white (rr) flowering plants are crossed, all offspring are heterozygous (Rr) and display the pink phenotype due to incomplete dominance. When these pink-flowered plants are self-crossed (Rr x Rr), the Punnett square would yield offspring in the genotypic ratio of 1 red (RR) : 2 pink (Rr) : 1 white (rr).Thus, 50% of the offspring would have the pink flowering phenotype (Rr). Therefore, the correct answer is B) 50%.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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