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In horses, black color (B) dominates chestnut color (b). Trotting gait dominates pacing gait (t). A cross is made between a horse homozygous for both black color and pacing gait and a horse homozygous for both chestnut color and trotting gait. The probable genotype of the offspring resulting from such a cross is  and the probable phenotype of the offspring resulting from such a cross is 

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Jean Keeling
Jean KeelingLv2
24 Feb 2020
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Related questions

1. Rabbits can have solidor spotted coats, and the base color can either be brown or black.Spotted coat color is dominant to solid, and black is dominant tobrown. A spotted, brown female (whose mother was solid black),mates with a solid, black male (whose parents were homozygous forthe black allele). What are the expected genotype and phenotyperatios for the offspring of this cross? Show your Punnet square toget full credit.

2. In horses, the roan coat color pattern is caused by a completely dominant allele (RnRn) at the Kit locus, such that heterozygotes (RnRnRn+) are roan. The Kit locus is linked to the Extension locus, which determines chestnut coat color. If a horse has two copies of the recessive e allele, then the horse will be chestnut (red). The E allele is completely dominant to e and animals with one copy of the E allele will have a base color of bay (brown) or black. The Kit and Extension loci recombine at a rate of 7%.

A heterozygous roan, homozygous bay/black stallion (RnRnRn+ EE) is mated to a mare with genotype RnRnRn+ Ee (roan, bay/black). The mare’s two haplotypes are RnRn E and Rn+ e. What will be the expected genotype frequency of the progeny?

3. Hemophilia locus: Corneal dystrophy locus:

Two alleles Two alleles

H = wild-type/normal D = wild-type/normal

h = hemophilia d = corneal dystrophy

H is completely dominant to h D is completely dominant to d

Both loci are sex-linked

The recombination frequency between these two loci is 0.10 (or 10%)

A male dog with both hemophilia and corneal dystrophy has a normal female pup without either disorder. This female pup is now two years old and is expecting her first litter.

A. If her pup is male, what is the probability that he will have both hemophilia and corneal dystrophy?

B. What is the probability that her male pups would not have hemophilia and would have corneal dystrophy?

C. If a male pup has corneal dystrophy, what is the probability that he will not have hemophilia?

Please show work. I want to learn how to do these problems.

Please assist with the following. Please no hand-written work, but typed work and thorough explanations please including Punnett Squares. Please Ignore Sex, as these are not sex-linked traits

Dihybrid Testcrosses

In the following crosses, the wild trait is dominant and the brown trait for eye color and ebony trait for body color are both recessive. You will compare the offspring of homozygous wild flies to the offspring of heterozygous wild flies, when each is crossed with a recessive brown-eyed fly with an ebony body.

7. Perform a monohybrid cross between a wild-type female fly and a male fly with brown eyes and ebony body.
Show results for the F1 offspring. (NOTE: You will use one of these F1 flies in the next cross.)
ENTER DATA HERE:

PUNNETT SQUARE:

List the genotypes of the flies in this cross:

List the gametes produced by each fly in this cross:

Show the Punnett Square for the above cross.

Question: By examining the offspring, determine whether the wild-type female parent was homozygous or heterozygous for eye color and body color. How did you arrive at this conclusion?

Question: Are the F1 offspring homozygous or heterozygous for eye color and body color? How did you arrive at this conclusion?

8. Now perform a cross between one wild-type F1 offspring from the previous cross and a male fly with brown eyes and ebony body.
ENTER DATA HERE:

PUNNETT SQUARE:

List the genotypes of the flies in this cross:

List the gametes produced by each fly in this cross:

Show the Punnett Square for the above cross.

Question: Even though you already knew the genotype of the wild-type fly used in this cross, how can you tell by examining the offspring of this cross whether the wild-type fly in this cross was homozygous or heterozygous for eye color?

Question: What was the phenotypic ratio for the offspring resulting from this testcross?

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