Question

A homozygous purple flower variety of pea plant (PP) is crossed with white flower variety of pea (pp). Mention the phenotype and genotype of F1 generations of offsprings.

Answer 1

Answer:

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 2

Answer:

Phenotypic Ratio =1:1

Genotypic Ratio=1:1

Explanation:

(i) The monohybrid cross is used to study the cross because it just involves the blossom colour. For the F1 generation, there were gammathes P and p. As a result, all of the genotypes are present in the progeny during the F1 generation: Pp or heterozygous purple flowers, which are all purple flowers (phenotype similar). The dominant trait colour, purple, has repressed the white colour trait.

1:1 phenotypic ratio

1:1 Genotypic Ratio

(ii) By further breeding these F1 offspring with one another,

P and phenotypic Ratio in gametes: 3:1 (3 Purple flowers and 1 White flower)

1:2:1 Genotypic Ratio (1 Homozygous Purple, 2 Heterozygous Purple, and 1 Homozygous White flower)

iii) Mendel's first law of inheritance is also known as the law of dominance. Only the dominant trait in the phenotypic will be passed down to hybrid offspring, in accordance with the law of dominance. Recessive traits are those that are suppressed, whereas dormant traits are those that are caused by the alleles.

iv) The garden pea's scientific name is Pisum sativum.

a. Thalassemia is a group of hereditary genetic disorders that restricts the amount of haemoglobin that a person can naturally generate. The body's ability to absorb oxygen is hampered by this disease.

b. Down's syndrome: Normally, a cell's nucleus includes 23 pairs of chromosomes, but Down syndrome develops when the 21st chromosome has three copies.

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