Question 10 0.33367 out of 1 points When the pattern of selection is overdominan

Question

Question 10 0.33367 out of 1 points When the pattern of selection is overdominance... Select all that apply Selected Answers: The heterozygote has the highest fitness one of the alleles will become fixed there will be an polymorphic equilibrium The heterozygote has the highest fitness A homozygote has the highest fitness one of the alleles will become fixed there will be an unstable equilibrium there will be an polymorphic equilibrium the final allele frequency depends on the initial allele frequency the final allele frequency does not depend on the initial allele frequency Answers:

Explanation / Answer

Overdominance is a situation in which heterozygotes at a particular locus tend to have higher fitness than homozygotes. Causes alleles to exist in a stable equilibrium.

Dominance is a key concept in Mendelian inheritance. Dominance in genetics is a relationship between alleles of one gene, in which the effect on phenotype of one allele masks the contribution of a second allele at the same locus. Generally, where a gene exists in two allelic versions (designated A and a), three combinations of alleles are possible: AA, Aa, and aa. If AA and aa individuals (homozygotes) show different forms of some trait (phenotypes), and Aa individuals (heterozygotes) show the same phenotype as AA individuals, then allele A is said to dominate, be dominant to or show dominance to allele a, and a is said to be recessive to A.

In some instances, offspring can demonstrate a phenotype that is outside the range defined by both parents. In particular, the phenomenon known as overdominance occurs when a heterozygote has a more extreme phenotype than that of either of its parents. Overdominance sometimes confers a survival advantage in the heterozygote. A well-known example of overdominance occurs in the alleles that code for sickle-cell anemia.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

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