The purpose of this activity is to ascertain eye-color genotypes that could be present in a accustomed population. This abstraction will booty into annual ascendant and backward ancestry as able-bodied as the evolving compassionate of the analysis of eye color.
Mendel aboriginal articular simple ascendant and backward ancestry in his acclaimed abstracts on pea plants. In animal beings, a babyish receives one set of genes from its ancestor and accession set from its mother. The aggregate of all of these genes, and the generally complicated interactions amid them, accord the babyish abounding of its concrete characteristics, including its eye color. It was aforetime anticipation that aloof two genes afflicted eye color. However, it was afresh apparent that the aboriginal gene is absolutely two audible genes! Although eye blush is much added complicated than we initially thought, for the purposes of this project we’ll keep things simple and focus on added accepted cases and the alternation of dominant and backward traits.
The afterward archetype shows the accessible abiogenetic outcomes for a ancestor with Bb and a mother with Bb.
Father’s Genotype
Bb (one gene for ascendant BROWN and the added for backward blue)
Father’s Phenotype
Because alone one gene charge be ascendant to appearance the ascendant trait, the ancestor has amber eyes.
Mother’s Genotype
Bb (one gene for ascendant BROWN and the added for backward blue)
Mother’s Phenotype
Because alone on gene charge be ascendant to appearance the ascendant trait, the mother has amber eyes.
As anniversary ancestor will alone canyon bottomward one of their two alleles to their offspring, we can actuate what combinations are accessible application a blueprint such as this:
Father →
BROWN (B)
blue (b)
Mother ↓
BROWN (B)
BB (brown eyes)
Bb (brown eyes)
blue (b)
bB (brown eyes)
bb (blue eyes)
Terms/Concepts: Mendel; Ascendant gene; Backward gene; Genetics; Inherited traits; Eye colors; Genotype; Phenotype; Allele
References:
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