Fruit Colour In Summer Squash

An example of dominant epistasis is found for fruit colour in summer squash. There are three types of fruit colours in this cucumber, viz., white, yellow and green. F2 phenotypic ratio: 12:3:1 Example: In summer squash fruit colour may be white, yellow or green.

White fruits are produced by a domain epistatic allele 'W'. At another locus 'Y' for yellow fruits is dominant to its allele 'y' for green fruits. Dominant white hides the effect of yellow or green.

9 Types of Summer Squash (and How to Cook Them)

Epistasis can also occur when a dominant allele masks expression at a separate gene. Fruit color in summer squash is expressed in this way. Homozygous recessive expression of the W gene (ww) coupled with homozygous dominant or heterozygous expression of the Y gene (YY or Yy) generates yellow fruit, and the wwyy genotype produces green fruit.

In summer squash, two genes interact to give a third phenotype. This interaction is called epistasis. In summer squash, three types of fruit colours appear, white, yellow and green.

Cucurbita Pepo Summer Squash

White colour fruit is determined by dominant gene W and its recessive allele is w and yellow colour is controlled by another dominant gene G and its recessive. White fruit color in summer squash is dependent on dominant allele W and colored fruit on recessive allele w. In the presence of ww and a dominant gene G, the color of the fruit is yellow.

When G is absent, i.e., when it's gg, then the color is green. What F2 phenotypes and proportions are expected when a white fruit WWGG is crossed with a green fruit wwgg? The color of the mature fruit flesh is most often light yellow-orange, but can range from greenish white to intense orange; it can be relatively thick or thin, and coarsely fibrous and tough to finely fibrous and tender (Paris, 2008). Whitwood (1975) studied the inheritance of tendril development and mature fruit color in Cucurbita pepo.

GENE EXPRESSION AND REGULATION - ppt download

Summer squash appears in many different fruit shapes and colors: Scallop or Patty Pan is round and flattened like a plate with scalloped edges, usually white but sometimes yellow or green. Inheritance of fruit color in summer squash provides an example of the phenomenon of epistasis. Yellow fruit is produced by a cross involving the homozygous recessive expression of the W gene (ww) and either the homozygous dominant (YY) or heterozygous (Y y) form of the Y gene.

The wwyy outcome is green fruit. Summer squash grows on nonvining bushes. Many varieties have different fruit shapes and colors.

The three main types include the yellow (straightneck or crookneck), the white (saucer shaped, scallop or pattypan) and the oblong (green, gray or gold zucchini). The main difference between summer and winter squash is summer squash is eaten when it is immature and the rind is tender. Interacts in complementary fashion with L-2 to condition orange fruit flesh color (5), with L-1 and L-2 to condition intense yellow color of young (summer squash) fruit (7), and with W to produce cream (instead of white) mature fruit color (13).

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