In cucumbers: Dull fruit (D) is dominant to glossy (d) Orange fruit (R) is dominant to...

In cucumbers:

Dull fruit (D) is dominant to glossy (d)

Orange fruit (R) is dominant to cream (r)

Bitter cotyledons (B) are dominant to nonbitter (b)

A cucumber with the genotype ddRrBb was crossed to a cucumber with the genotype DdRrBb

using a branch diagram, determine the probability that an offspring from this cross will be dull and cream with nonbitter cotelydons? (Type in as a decimal and round to 6 decimal digits.)

Solutions

Expert Solution

It is given that

The dominant allele D for dull and recessive allele d for glossy

The dominant allele R for orange and recessive allele r for cream

The dominant allele B for bitter and recessive allele b for non-bitter

Parents - ddRrBb (Glossy and orange fruit with bitter cotyledons) x DdRrBb (Dull and orange with bitter cotyledons)

Gametes - dRB, dRb, drb, drB DRB, DRb, DrB, Drb, dRB, drb, drB, dRb

Cross-

	DRB	DRb	DrB	Drb	dRB	drb	drB	dRb
dRB	DdRRBB - dull and orange with bitter cotyledons	DdRRBb - dull and orange with bitter cotyledons	DdRrBB - dull and orange with bitter cotyledon	DdRrBb - dull and orange with bitter cotyledon	ddRRBB - Glossy and orange with bitter cotyledon	ddRrBb - glossy and orange with bitter cotyledon	ddRrBB - glossy and orange with bitter cotyledon	ddRRBb - glossy and orange with bitter cotyledon
dRb	DdRRBb - dull and orange with bitter cotyledon	DdRRbb - dull and orange with non-bitter cotyledon	DdRrBb - dull and orange with bitter cotyledon	DdRrbb - dull and orange with non-bitter cotyledon	ddRRBb - glossy orange with bitter cotyledon	ddRrbb - glossy orange non-bitter cotyledon	ddRrBb - glossy and orange with bitter cotyledon	ddRRbb - glossy and orange with non-bitter cotyledon
drb	DdRrBb - dull and orange with bitter cotyledon	DdRrbb - dull and orange with non-bitter cotyledon	DdrrBb - dull and cream with bitter cotyledon	Ddrrbb - dull and cream with non-bitter cotyledon	ddRrBb - glossy and orange with bitter cotyledon	ddrrbb - glossy and cream with non-bitter cotyledon	ddrrBb - glossy and cream with bitter cotyledon	ddRrbb - glossy and orange with non-bitter cotyledon
drB	DdRrBb - dull and orange with bitter cotyledon	DdRrBb - dull and orange with bitter cotyledon	DdrrBB - dull and cream with bitter cotyledon	DdrrBb - dull and cream with bitter cotyledon	ddRrBB - glossy and orange with bitter cotyledon	ddrrBb - glossy and cream with bitter cotyledons	ddrrBB - glossy and cream with bitter cotyledons	ddRrBb - glossy and orange with bitter cotyledon

Thus the probability of occurrence of dull and cream fruit with non-bitter cotyledons - (3/4) x (1/4) x (1/4)

= 3/64 = 0.046875

gladiator answered 1 year ago

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