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8/3/2019 Morphological Variations
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The plants produce clusters of tiny white tubular flowers on branch tips.
These flowers are surrounded by modified leaves (papery bracts) with bright colors,
ranging from pink to white as well as shades of orange and yellow.
The variations are due to the presence of certain pigments. When petals
contain enough carotene, they will look yellow, orange and dark brown. Anthocyanin
is responsible for red, purple or blue colors.
The crown of thorns is a low growing, heavily branched, woody shrub,
with oval shaped leaves and dense stems covered by many sharp, spiny thorns.
It has brightly colored bracts, modified leaves, which resemble petals and give
the plant its colorful look while the true flowers are small.
Color of the bracts ranges from red to pink. There are also yellow to green
varieties. Pigments are responsible for the color of the bracts. The color-producing
pigments in flowers are flavonoids, which are commonly found in roses and produce red and blue
colors; carotenoids, which produce yellow and orange coloring and are present in marigolds and
sunflowers; and chlorophyll, the third pigment, which gives plants their green color. Through mixing
and matching these three pigments, new colors can be created in flowers.
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It is interesting to note that every stripe pattern is unique. No two tigers are
marked the same, much like a person's fingerprints. The orange colored tiger with
black stripes is, of course, the most prevalent. There are different shades of orangeranging from almost yellow to dark burnt orange. The stripes also vary in shade, size
and abundance. Some tigers will have dark, wide stripes while some have fewer
stripes that are narrower.
Color and striping is controlled by gene groups that are inherited from the
parent's genes, the same as hair color in humans. A person may have dark hair and
that would be the trait they most likely would pass on to their children, especially if
both parents have the same color gene.