Question

SECTION C ::::::)
After self-pollination in pea plants with round, yellow seeds, following types of seeds were obtained
by Mendel :

Seeds , Number

Round, yellow-630
Round, green-216
Wrinkled, yellow-202
Wrinkled, green-64

Analyse the result and describe the mechanism of inheritance which explains these results.
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Answer 1

When we see the phenotype of the two types of progeny we find that both the types have the seed colour yellow while approximately 50 % of them have round seed type while the other 50 % have wrinkled seed type . So , the pea plant with yellow and round seeds must be homozygous for yellow seed colour ( YY ) while it must be heterozygous for the round seed type ( Rr ) .

So , the genotype of the plant with yellow and round seed is YYRr .

[ Note : Seed colour : Yellow is dominant , green is recessive .

Seed type : Round is dominant , wrinkled is recessive . ]

So , the correct answer is ' YYRr ' .