Key:In Smurfs, dwarf (T) is dominant to tall (t), pink (B) is dominant to blue (

Question

Key:In Smurfs, dwarf (T) is dominant to tall (t), pink (B) is dominant to blue (b), and happy (G) is dominant to gloomy (g). All loci are autosomal and not linked. The phenotypes of parents and their progeny are given for several crosses below. Determine the most likely genotypes for each parent and write them in the appropriate spaces below. Note that the parents may not be pure breeding.

Female Parent Genotype
Height locus:  
Color locus:  
Disposition locus:  

Male Parent Genotype
Height locus:
Color locus:
Disposition locus:

Female Parent Phenotype Male Parent Phenotype Progeny Numbers and Phenotypes Dwarf, Blue, Gloomy Tall, Blue, Happy 21 Dwarf, Blue, Happy
24 Tall, Blue, Happy
23 Dwarf, Blue, Gloomy
22 Tall, Blue, Gloomy

Explanation / Answer

Answer:

Female Parent Genotype
Height locus: Tt
Color locus: bb
Disposition locus: gg

Male Parent Genotype
Height locus: tt
Color locus: bb
Disposition locus: Gg

Explanation:

For Height and Disposition locus, according to Mandalian's law, if 50% progeny is Dwarf and 50% is Tall, then one of parent will be pure recessive and one of the parent will be trait for that genotype. This explains two charatcers:- Height locus and Disposition locus. So Female Parent Genotype will be Height locus: Tt and Disposition locus: gg, Male Parent Genotype will be Height locus: tt nad Disposition locus: Gg.

For Colour Locus:  according to Mandalian's law, if all progeny are in recessive phenotype, (In this example: all progeny phenotypes are blue), then both parent's genotypes will be pure recessive, then only it will be expressed.

Related Questions

Navigate

• Browse (All)
• Browse K
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.