A snapdragon plant has red, pink, or white flowers, inherited in an incomplete dominance pattern. It’s...

A snapdragon plant has red, pink, or white flowers, inherited in an incomplete dominance pattern. It’s height is inherited in a dominant/recessive pattern. It can come in tall (T) or dwarf (homozygous recessive) varieties. What is the ratio expected if you cross a pink-tall (Tt) plant with a pink-short (tt) plant?

1 red tall: 1 red dwarf: 2 pink tall : 2 pink dwarf : 1 white tall : 1 white dwarf
1 red tall : 1 red dwarf : 1 pink tall : 1 pink dwarf : 1 white tall : 1 white dwarf
3 red tall : 3 red dwarf : 1 white tall : 1 white dwarf
2 red tall : 2 red dwarf : 1 pink tall : 1 pink dwarf : 1 white tall : 1 white dwarf
2 red tall: 1 red dwarf : 1 pink tall : 1 pink dwarf : 2 white tall : 1 white dwarf

Expert Solution

Flower color in snapdragon plant shows incomplete dominance. This indicates that the pink flower is an intermediate character (heterozygous). Let the genotype for red flowers be denoted by 'RR' and the genotype for white flowers be denoted by 'rr'. Therefore, the genotype for pink flowers will be 'Rr', that is, a mix of red and white color. It has been given that, pink-tall plant (RrTt) is crossed with pink-short plant (Rrtt). The punette square for this cross has been given below-

	RT	Rt	rT	rt
Rt	RRTt (Red-tall)	RRtt (Red-dwarf)	RrTt (Pink-tall)	Rrtt (Pink-dwarf)
Rt	RRTt (Red-tall)	RRtt (Red-dwarf)	RrTt (Pink-tall)	Rrtt (Pink-dwarf)
rt	RrTt (Pink-tall)	Rrtt (Pink-dwarf)	rrTt (White-tall)	rrtt (White-dwarf)
rt	RrTt (Pink-tall)	Rrtt (Pink-dwarf)	rrTt (White-tall)	rrtt (White-dwarf)

Thus, the ratio will be 2 red tall : 2 red dwarf : 4 pink tall : 4 pink dwarf : 2 white tall : 2 white dwarf

or 1 red tall : 1 red dwarf : 2 pink tall : 2 pink dwarf : 1 white tall : 1 white dwarf

Thus, option A will be correct.

gladiator answered 5 months ago

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