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In cucumbers, dull fruit (D) is dominant over glossy (d) fruit, orange friut (R) is dominant over cream fruit (r), and bitter co

stiv31 [10]

Explanation:

Dull fruit (D) is dominant over glossy (d) fruit.
Orange friut (R) is dominant over cream fruit (r).
Bitter cotyledon (B) is dominant over non-bitter cotyledons (b).

The three genes are independent.

A plant homozygous for dull, orange fruit and bitter cotyledons has the genotype <em>DDRRBB</em><em>.</em>
A plant homozygous for glossy, cream fruit and non-bitter cotyledons has the genotype <em>ddrrbb</em>.

100% of the F1 will have dull, orange fruit and bitter cotyledons and will be heterozygous for all genes: <em>DdRrBb</em>.

<u>The F2 will have 8 possible phenotypes:</u>

27 D_R_B dull, orange fruit and bitter cotyledons
9 D_R_bb dull, orange fruit and non-bitter cotyledons
9 D_rrB_ dull, cream fruit and bitter cotyledons
3 D_rrbb dull, cream fruit and non-bitter cotyledons
9 ddR_B_ glossy, orange fruit and bitter cotyledons
3 ddR_bb glossy, orange fruit and non-bitter cotyledons
3 ddrrB_ glossy, cream fruit and bitter cotyledons
1 ddrrbb glossy, cream fruit and non-bitter cotyledons

An F1 plant is crossed with a plant that has glossy, cream fruit and non-bitter cotyledons.

<h3>DdRrBb x ddrrbb </h3>

The F1 individual can produce 8 types of gametes: DRB, DRb, DrB, Drb, dRB, dRb, drB and drb. The cream fruit and non-bitter cotyledons individual can only produce drb gametes. This cross also produces a progeny with the following genotypes and phenotypic proportions: