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Like Mother ... Like Plant

If these two flowers produced seeds, what color would the offspring be?

Logic tells you they would have to be white or pink. White is a trait of one parent and pink is a trait of the other.

But suppose the white color is dominant. You can think of the dominant color as being stronger. That means if one parent passes on a white gene and the other passes on a pink one, the offspring will be white. They still show the inherited trait of a parent organism.

In our example the white flower and pink flower are purebred. A purebred Golden Retriever has Golden Retriever parents. The white flower had white parents and the pink one had pink parents. Their offspring would be a hybrid or a combination.

 

Now it gets more complicated. If we cross the offspring that show the color trait for the white parent what will you get?

 

This grid helps determine what offspring two parents may have. Does the pink one surprise you?

Remember, the the second group of parents are hybrid white. This means they carry the gene for pink, although they are white. When one hybrid white gives a pink gene and the other hybrid white gives a pink gene the offspring will be pink!

The First Generation plants as parents shown at the right and left in the diagram below.

Purebred
 
Purebred
+
= Second Generation (shown below)
 
The Second Generation plants are the parents shown at the right and left in the diagram below.
Hybrid

Hybrid
+
= Third Generation (shown below)

 

It's true!

A tall pea plant is crossed with a short pea plant. The resulting seeds were planted in the same garden. Below you see the results of these pea plant parents.

The First Generation plants as parents shown at the right and left in the diagram below.

Purebred Tall
 
Purebred Short
+
= Second Generation - all hybrid tall (shown below)
 
The Second Generation plants are the parents shown at the right and left in the diagram below.
Hybrid tall

Hybrid tall
+
= Third Generation (shown below)
Purebred Tall
Hybrid Tall
Hybrid Tall
Purebred Short

 

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Updated October 24, 2008 by: Glen Westbroek

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