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Answered

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Cause and Effect What
happened to the yellow-pod
characteristic in the F, cross?
Write the effect of the F, cross
on the yellow-pod characteristic,
and then write the cause.
Effect:
Cause:

Sagot :

marianaegarciaperedo

From a cross between a green-poded plant with a yellow-poded plant, the whole F1 resulted in green-poded plants. Cause: Complete dominance / Segregation Principle. Consequence: Dominant trait expression.

Cross

The cross was performed using two pure-bred plants

  • A green-poded plant

  • A yellow-poded plant

First Generation

Only green-poded plants emerged from the cross

Meldel's First Law: Segregation principle

  • Mendel named dominant to the expressed variant in the F1 ⇒ Green pods

  • He named recessive 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.

Complete dominance

  • 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,

Cause:

Complete dominance. Segregation principle

  • Two alleles are involved. Two alternative forms of the same gene.

  • One of them is dominant over the other one

Effect:

The dominant trait is expressed: Green pods.

  • Individuals among the F1 are heter0zyg0us for the trait.

  • The dominant allele is hiding the expression of the recessive allele.

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You will learn more about complete dominance and Segregation principle at:

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