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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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