In certain species of plants, purple flowers (P) are dominant to white flowers (p). If two heterozygous plants are crossed, what will be the phenotype of the offspring?
a) 100% purple flowers
b) 100% white flowers
c) 75% white flowers, 25% purple flowers
d) 25% white flowers, 75% purple flowers
Please give the answer fast
Answers
Answer:
100% purple
Explanation:
A monohybrid cross is a mating between two individuals with different alleles at one genetic locus of interest.
The cross between PP (purple flowers) and pp (white flowers) will produce pea plant having purple flowers having genotype Pp. P would be a dominant trait and p is a recessive trait, therefore plants having Pp genotype would be of purple colored.
Therefore, the correct answer is option B.
Answer:
Option d) 25% white flowers, 75% purple flowers
Explanation:
A monohybrid cross-refers to the cross or mating between two different individuals having a genotype of a single trait, located at one gene locus. i.e. when only one allelic pair (of contrasting characters) is considered in cross-breeding, it is said to be a monohybrid cross.
As given, the purple flowers are dominant over white flowers this shows the expression of dominant character in F1 progenies (law of dominance).
Parents: Pp x Pp
↓ ↓
Gametes: P, p P , p
F1 Generation: PP , Pp, pP , pp
Hence the resulted genotypes of the offspring are PP, Pp, pp.
Thus the phenotypic ratio of ‘purple: white’ flowers in F1 generation is 3:1.
As per the result obtained,
PP- 1 – homozygous (pure) purple-coloured flowers
Pp- 2 - Hybrid,(heterozygous) purple-coloured flowers
pp- 1 - homozygous (pure) white-coloured flowers
Hence the genotypic ratio is 1:2:1
And the phenotypic ratio is 3:1 (mendelian monohybrid cross-ratio)
Hence according to the ratio, the phenotype would be d) 25% white flowers, 75% purple flowers.
A cross between two individuals who differ in only a pair of contrasting characters is called a monohybrid cross. In a hybrid where both the characters are present, only one expresses itself called dominant while the other remains suppressed is called recessive in the F1 generation.
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