Question

In: Biology

In a certain variety of onions, pungent smell (P) is completely dominant to subtle smell (p),...

In a certain variety of onions, pungent smell (P) is completely dominant to subtle smell (p), yellow (A) is completely dominant to white (a), and large bulb (B) is completely dominant to small bulb (b). For the following crosses and results, what are the genotypes of the parents?

- pungent, large x subtle, large. 3⁄4 pungent, large; 1⁄4 pungent, small

- subtle, white x subtle, yellow 1⁄2 subtle, white; 1⁄2 subtle, yellow

- yellow, large x white, small 1⁄4 yellow, large; 1⁄4 white, small; 1⁄4 yellow, small; 1⁄4 white, large

- subtle, white, large x pungent, white, large. 1⁄2 pungent, white, large; 1⁄2 subtle, white, large

- subtle, yellow, large x subtle, yellow, small. all subtle, yellow, large

What phenotypic ratio is expected from a crossing an onion of genotype Pp Aa bb with an onion of genotype PP aa Bb?

Expert Solution

Answer:

1). pungent, large (PPBb) x subtle, large (ppBb)= 3⁄4 pungent, large (PpB_); 1⁄4 pungent, small (Ppbb)

2). subtle, white (ppaa) x subtle, yellow(ppAa)= 1⁄2 subtle, white (ppaa); 1⁄2 subtle, yellow (ppAa)

3). yellow, large (AaBb) x white, small (aabb) = 1⁄4 yellow, large (AaBb); 1⁄4 white, small (aabb); 1⁄4 yellow, small (Aabb); 1⁄4 white, large (aaBb)

4). subtle, white, large (ppaaBB) x pungent, white, large (PPaaBB)= 1⁄2 pungent, white, large (PpaaBB); 1⁄2 subtle, white, large (PpaaBB)

5). subtle, yellow, large (ppAABB) x subtle, yellow, small (ppAAbb)= all subtle, yellow, large (ppAABb)

6).

PpAabb x PPaaBb –Parents

	PaB	Pab	paB	pab
PAb	PPAaBb (pungent, yellow, large)	PPAabb (pungent, yellow, small)	PpAaBb (pungent, yellow, large)	PpAabb (pungent, yellow, small)
Pab	PPaaBb (pungent, white, large)	PPaabb (pungent, white, small)	PpaaBb (pungent, white, large)	Ppaabb (pungent, white, small)
pAb	PpAaBb (pungent, yellow, large)	PpAabb (pungent, yellow, small)	ppAaBb (subtle, yellow, large)	ppAabb (subtle, yellow, small)
pab	PaaBb (pungent, white, large)	Ppaabb (pungent, white, small)	ppaaBb (subtle, white, large)	ppaabb (subtle, white, small)

pungent, yellow, large = 3/16

pungent, white, large = 3/16

pungent, yellow, small = 3/16

pungent, white, small = 3/16

subtle, yellow, large = 1/16

subtle, yellow, small = 1/16

subtle, white, large = 1/16

subtle, white, small = 1/16

Phenotypic ratio = 3:3:3:3:1:1:1:1

gladiator answered 1 year ago

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