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In horses, the Overo gene, Ov, produces a white splotch pattern on the coat. The overo phenotype is seen only when a horse has one Ov copy, Ovov. Horses with two Ov copies, OvOv, die soon after birth and are called white overo because they are completely white. Horses with no Ov copies are solid colored, ovov. The Leopard complex gene, Lp, shows incomplete dominance and controls white spotting. One Lp allele, Lplp, produces the leopard phenotype, in which there are spots everywhere. Two Lp alleles, LpLp, produce the fewspot phenotype, in which the horse is mostly white with colored spots. A horse that is both overo and leopard is called pintaloosa, and these horses are spotted with splotches. A horse that is overo and fewspot is considered fewspot because the white areas from Lp is indistinguishable from the white from Ov.

Suppose that 16 pairs of pintaloosa horses have one offspring per pair. How many of each phenotype would be expected? Determine the number out of 16 expected for each phenotype. Only count phenotypes for offspring expected to live past one week of age.

Number of:
Solid:____
Fewspot:_____
White Overo:______

Respuesta :

Answer: Solid: 1 out 16;

              Fewspot: 3 out 16;

              White Overo: 0

Explanation: A pintaloosa horse is a horse which has genotype LplpOvov, i.e., it is heterozygous for overo and leopard.

Using a Punnett's square, a pair of pintaloosas can produce the following possibilities of offsprings:

  • Overo genotype

          Ov           ov

Ov    OvOv      Ovov

ov     Ovov      ovov

  • Leopard genotype

          Lp           lp

Lp     LpLp      Lplp

lp      Lplp       lplp

The expected phenotype for:

  1. Solid is related to the Overo gene and its genotype is ovov, so from the Punnett's square, the possibility for a offspring is 1 out of 16;
  2. Fewspot is related to both Overo and Leopard gene. A fewspot horse is both Ovov and LpLp, so the number is 3 out of 16;
  3. White Overo is related to the Overo gene and these offspring dies at birth. Since it is asking for the number of ofspring to live past one week of age, there will 0 white overos;
adioabiola

The number of solid overo is 2, fewspot is 3 and white Overo is 0

The question above is incomplete. The complete question is given below:

In horses, the Overo gene, Ov, produces a white splotch pattern on the coat. The overo phenotype is seen only when a horse has one Ov copy, Ovov. Horses with two Ov copies, OvOv, die soon after birth are called white overo because they are completely white. Horses with no Ov copies are solid colored, ovov.

The Leopard complex gene, Lp, shows incomplete dominance and controls white spotting. One Lp allele, Lplp, produces the leopard phenotype, in which there are spots everywhere. Two Lp alleles, LpLp, produce the fewspot phenotype, in which the horse is mostly white with colored spots.

A horse that is both overo and leopard is called pintaloosa, and these horses are spotted with splotches. A horse that is overo and fewspot is considered fewspot because the white areas from Lp is indistinguishable from the white from Ov.

Suppose that 16 pairs of pintaloosa horses have one offpring per pair. How many each phenotype would be expected? Determine the number out of 16 expected for each phenotype. Only count phenotypes of offspring expected to live past one week of age. overo: white overo: fewspot:

The solution is given below:

It is very clear from the complete question that the number of:

Solid is 2

Fewspot is 3

White Overo is 0

What is a pintaloosa?

A pintaloosa is a type of horse which is produced from the breeding between overo and leopard.

So from the parameters given in the question, 2 different individuals possess genotype for overo (Ovov) phenotype.

This goes to say that just only out of the 16 pair will have an overo phenotype.

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