From a cross between a green-poded plant with a yellow-poded plant, the whole F1 resulted in green-poded plants. <u>Cause:</u> Complete dominance / Segregation Principle.<u> Consequence: </u>Dominant trait expression.
<h3>Cross</h3>
The cross was performed using two pure-bred plants
<h3>First Generation</h3>
Only green-poded plants emerged from the cross
<h3 /><h3>Meldel's First Law: Segregation principle</h3><h3 />
- Mendel named <em>dominant</em> to the expressed variant in the F1 ⇒ Green pods
- He named <em>recessive</em> trait to the alternative hiden variant ⇒ Yellow pods
- Mendel explained his results by arguing that discrete factors were responsible for these phenotypes.
- Each plant has a pair of factors. These factors are the alleles.
- Each allele codes for one trait (green or yellow)
⇒ The dominant allele codes for the dominant trait (Green)
⇒ The recessive allele codes for the recessive trait (Yellow)
- One of these alleles came from one parental plant, and the other allele came from the other plant.
- Alleles separate during gamete formation, giving two types of gametes, each with only one factor.
<h3>Complete dominance</h3>
- When the dominant allele completely masks the recessive allele, we talk about complete dominance.
- This is the case of individuals that are heter0zyg0us for a particular gene and express the dominant trait.
- The dominant allele is hiding the expression of the recessive allele.
- Many genes show complete dominance.
From the result of the cross between two pure bred plants, we might say that,
<h2>Cause: </h2><h3>Complete dominance. Segregation principle</h3><h3 />
- Two alleles are involved. Two alternative forms of the same gene.
- One of them is dominant over the other one
<h2>Effect:</h2><h3>The dominant trait is expressed: Green pods. </h3><h3 />
- Individuals among the F1 are heter0zyg0us for the trait.
- The dominant allele is hiding the expression of the recessive allele.
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