What change must have occurred during the evolution from invertebrate chordates to vertebrate chordates
1 answer:
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Answer:
F1 generation: RrUu, rrUU, rrUu, RrUU
25% : 25%: 25%: 25%
Ratios
- genotype: 1: 1: 1: 1 ...(from punnet square)
- phenotype: 1 : 1
Explanation:
Punnett squares are a diagrammatic way of deciding the characteristics of hybrid offspring created by crosses in genetic breeding. Parental genotypes and phenotypes are widely recognized, and all usually obey normal Mendelian ratios and inheritance.
Mendelian genetics focuses on the origin or heritability of characteristics. Such traits are packed into one's own gamete, acquired by themselves, and sometimes display superiority, where one's impact can mask those of another trait.
These are called the Law of Segregation, Independent assortment and Dominance respectively.
For this cross... Assuming:
Unattached lobes= dominant
- Rolling tongue= dominant
- Parent generation or P generation:
Gametes:
R → rolling dominant (R), non-rolling recessive (r)
U → unattached dominant (U), attached recessive (u)
P generation: RUrU× rUru
rolling, unattached × non-rolling, unattached
F1 generation: RrUu, rrUU, rrUu, RrUU
25% : 25%: 25%: 25%
Ratios
- genotype: 1: 1: 1: 1 ...(from punnet square)
- phenotype: 1 : 1
<em><u>Half the offspring have unattached lobes and can roll their tongues while the other half have unattached lobes and cannot roll their tongues...</u></em>
Each punnet cross is attached below
