Background and/or Instructions Problem No 9 Objective: To apply the concept of c

Question

Background and/or Instructions Problem No 9 Objective: To apply the concept of codominance in the prediction of horse coat color In codominance, both alleles are expressed; both gene products are measurable or visible as an additional phenotype that is neither dominant nor recessive nor intermediate. In incomplete (partial) dominance an intermediate trait is produced Cremello almost white Palomino golden with lighter mane and tail Chestnut reddish brown Coat color of horses is a very complex The following table gives ratios obtained in matings of the above horse (Equus caballus) varieties: e colors cremello, chestnut and Offspring palomino can be explained using a codominant model of inheritance and are known to be determined by alleles at a single locus in horses. Cross Parents all cremello cremello x cremello chestnut x chestnut cremello x chestnut palomino x palomino all chestnut For this problem, use the genotypes all palomino CC-cremello C2c2 chestnut % chestnut % palomino % cremello IV Cc2- palomino If cross IV (palomino X palomino) is represented by CICX ??, what are the genotypic proportions of the offspring? a. Locus is the physical position of an allele on a chromosome (plural loci). As the position of a gene (or allelic form of one) the concept of locus becomes important when mapping chromosomes,i.e., locating the positions of loci. b. Cross lIl (cremello X chestnut) can be represented by Cc1 x C'C2, what is the genotype of the palomino offspring? Although mass sequencing projects may have obviated the need for chromosome mapping, the association (linkage) between or among alleles led to important discoveries and applications in genetics. Why do crosses I (cremello X cremello) and II (chesnut X chesnut) produce all cremello and all chestnut, respectively, if cremello X chestnut produces all palomino? c.

Explanation / Answer

Answer.

A. C1C2 X C1 C2 = PARENTS

F1 GENERATION =

C1C1 = Cremallo

2C1C2 = Palomino

C2C2 = Chestnut

Answer b.

C1C1 X C2C2 = parents

Gametes C1 and C2

F1 generation = C1C2= Palomino horse

Answer c.

This happens in incomplete dominance. Mixed expression is seen for a trait or where blend trait is received at F1.

White + dark brown = light brown (palomino)

Related Questions

Navigate

• Browse (All)
• Browse B
• Subjects

---

---

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