A garden pea plant heterozygous for both stem height allele and flower colour is crossed with another plant which is dwarf and white in flower colour.Find the genotypic and phenitypic ratio of their offspring
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SsCc x sscc
Ss;Cc;cc
ss;Cc;cc
1/4 will be SsCc tall, color
1/4 will be Sscc tall, white
1/4 will be ssCc dwarf, color
1/4 will be sscc dwarf, white
To find the genotypic and phenotypic ratio of the offspring, we need to understand the principles of Mendelian genetics.
In this case, the garden pea plant is heterozygous for both the stem height allele and the flower color gene. Let's assume the dominant allele for stem height is T (tall) and the recessive allele is t (dwarf). Similarly, let's assume the dominant allele for flower color is C (colored) and the recessive allele is c (white).
The genotype of the parent plant can be written as TtCc, where Tt represents the heterozygous genotype for stem height and Cc represents the heterozygous genotype for flower color.
The other plant is dwarf and has white flowers. So, its genotype would be ttcc.
Now, let's consider the possible genotypes and phenotypes of the offspring:
1. Stem height: The offspring can inherit either the dominant allele (T) or the recessive allele (t) from the parent plant. Therefore, the genotypic ratio for stem height would be 1:1.
2. Flower color: Similarly, the offspring can inherit either the dominant allele (C) or the recessive allele (c) from the parent plant. Therefore, the genotypic ratio for flower color would also be 1:1.
To determine the phenotypic ratio, we need to consider the traits that actually manifest in the offspring:
1. Stem height: If the offspring inherits the dominant allele (T) for stem height, it will be tall. If it inherits the recessive allele (t), it will be dwarf. Therefore, the phenotypic ratio for stem height would also be 1:1.
2. Flower color: If the offspring inherits the dominant allele (C) for flower color, it will be colored. If it inherits the recessive allele (c), it will be white. Therefore, the phenotypic ratio for flower color would also be 1:1.
In summary, the genotypic ratio of the offspring would be 1:1 for both stem height and flower color. Similarly, the phenotypic ratio of the offspring would also be 1:1 for both stem height and flower color.