A double homozygous tall pea plant with green cotyledons is crossed with pure dwarf plant with yellow cotyledons. The offspring are crossed with pure dwarf plant with green cotyledons. How many different phenotypes will be obtained in this progeny?

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Solution

The correct option is C 4
TtYy
ttyy TY Ty tY ty
ty TtYy
(tall and yellow cotyledon) Ttyy
(tall and greencotyledon)
ttYy
(dwarf and yellow cotyledon)
ttyy
(dwarf and green cotyledon)
Tallness and yellow cotyledons are dominant in pea plants over dwarf and green ones. A cross between double homozygous tall pea plant with green cotyledons (TTyy) and pure dwarf plant with yellow cotyledons (ttYY) will give all tall progeny with yellow cotyledon (TtYy). Cross of tall plant with yellow cotyledon (TtYy) with pure dwarf plant with green cotyledons (ttyy) gives four phenotypes. Correct answer is C.

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TtYy ttyy	TY	Ty	tY	ty
ty	TtYy (tall and yellow cotyledon)	Ttyy (tall and greencotyledon)	ttYy (dwarf and yellow cotyledon)	ttyy (dwarf and green cotyledon)