This figure illustrates the results of selection for yeast strains that are well

Question

This figure illustrates the results of selection for yeast strains that are well adapted to either high-salt or low-glucose environments. Over the course of selection, many mutations have occurred in populations in both environments. If the Dobzhansky-Muller model applies to this experiment, what do you predict will happen if the two strains produce a hybrid? PMA Click to view larger image. O a. O b. O c. dMatings between individuals from the two strains will have reduced reproductive success compared to the controls. Matings between individuals from the two strains will have greater reproductive success compared to the controls. Matings between individuals from the two strains will have no difference in reproductive success compared to the controls. Matings between individuals from the two strains will be completely unsuccessful.

Explanation / Answer

Ans:- D mating betwwen individuals from two strains will have reduced reproductive success compared to controls.

Yes. Dobzhansky Muller model applies to given experiment.

According to Dobzhansky- Muller model- A single species of yeast have split into 2 strains having different adaptations. The chromosomal mutation has given rise to new allele(for high salt environment) fixed to particular position. Due to mutation and natural selection now this strain have genetic make up different from original strain. In Another diverge lineage will have a new allele responsible for other adaptation (e.g low glucose envoirnment). It will have a different allele position on gene.

These 2 lineage have changed genetic make up over time through mutation and natural selection , choosing most favourable adaptation for survival. As these are diverge from each other they will not be compatible to each other.and cannot reproduce with each other. This is a kind of reproductive isolation. The products of genes produced by protein synthesis are different in each strains. so these are incompatible to each other.

But these strains can reproduce with ancestral species but as these allelic changes are favourable for survival, these alleles will be expressed in that condition also. Ultimately these alleles will be permanent in that population and original species will split into 2 new species which are genetically incompatible. Hence cannot give reproductively succesful hybrids.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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