Question

In: Biology

Cat coat color is controlled by an X-linked gene with two alleles: XB= Black and XO...

Cat coat color is controlled by an X-linked gene with two alleles: X^B= Black and X^O = Orange. A population of cats in Tampa was found to consist of the following phenotypes:

	Black	Orange	Calico	Totals
Males	311	42	0	353
Females	277	7	54	338

Calculate the allelic frequency using all of the available information.

Expert Solution

First the males=

There are 311 black male cates, so here we have 311 XB alleles, as the males only have on X chromosome and this gene is link to this chromosome.

There are 42 orange male cates, so here we have 42 XO alleles.

Second the females=

There are 277 black females cats, so we have 554 XB alleles, because the female have two X chromosome and the gene is link to this chromosome, now we have to multiply 277*2 to obtain 554.

Then, there are 7 orange female cats, the same happens, the females has two X chromosomes so it is 7*2=14. There are 14 XO alleles

Finally, there are 54 calico female cats (that have orange and black, so they have both chromosmes), so here we have 54 XB alleles and 54 XO alleles.

Total of alleles=

XB= 311+554+54=919

XO=42+14+54=110

To calculate the allelic frequency we have to divide each total of alleles with the total of alleles. The total of these alleles are obtain these way= 353 +676=1029. 353 because this is the total of alleles in the males, as they only have one X chromosome. 676 as we have to consider the double of females (338*2) as the females have two X chromosomes.

Allelic frequency=

XB=919/1029=0.893

XO=110/1029=0.106

gladiator answered 2 years ago

In a population of mice, coat color is controlled by a gene locus with two alleles,...

In a population of mice, coat color is controlled by a gene locus with two alleles, B and W. BB mice are brown, BW are tan and WW mice are white. What is this type of inheritance called? In this population there are 20 brown mice 15 tan mice and 30 white mice. Calculate p and q for this population where p = the allele frequency of B and q = the allele frequency of W.

Suppose that a particular gene that controls coat color in dogs is controlled by four alleles...

Suppose that a particular gene that controls coat color in dogs is controlled by four alleles in the population. These alleles are called cch (chinchilla dog), cd (white dog with dark eyes), cb (pale gray dog) and c (albino dog). The alleles are given from the most dominant to the most recessive. Let’s assume that a particular population of these dogs is in Hardy-Weinberg equilibrium. The allele frequencies for our four alleles are: cch = 0.37 cd = 0.23 cb...

1. In cats, coat color is controlled by a gene on the X chromosome. Yellow coat...

1. In cats, coat color is controlled by a gene on the X chromosome. Yellow coat color is determined by the b allele and black coat color is determined by the B allele. The heterozygous condition results in a color known as tortoise shell. a. What phenotypic ratio of offspring would be expected from a cross between a yellow male and a tortoise-shell female? b. What proportion of the female offspring from a cross between a black female and a...

a. In a pea plant, leaf color is controlled by a gene with two alleles: a...

a. In a pea plant, leaf color is controlled by a gene with two alleles: a dominant allele G for green leaves, and a recessive allele g for yellow leaves. A researcher crossed a plant with green leaves with a plant with yellow leaves. All the resulting offspring had green leaves. What were the genotypes of the two parental plants? (5 points) b. Explain briefly what is a bottleneck effect and give two examples (the examples can be imaginary). (5 points)

The coat color in mink is controlled by two codominant alleles at a single locus. Red...

The coat color in mink is controlled by two codominant alleles at a single locus. Red coat color is produced by the genotype R1R1, silver coat by the genotype R1R2, and platinum color by R2R2. White spotting of the coat is a recessive trait found with the genotype ss. Solid coat color is found with the S- genotype. Two crosses are made between mink. Cross 1 is the cross of a solid, silver mink to one that is solid, platinum....

In rats, gene B produces black coat color if the genotype is B-, but black pigment...

In rats, gene B produces black coat color if the genotype is B-, but black pigment is not produced if the genotype is bb. At an independent locus, gene D produces yellow pigment if the genotype is D-, but no pigment is produced when the genotype is dd. Production of both pigments results in brown coat color. If neither pigment is produced, coat color is cream. A third independently assorting gene involved in determination of coat color in rats is...

In rats, gene B produces black coat color if the genotype is B–, but black pigment...

In rats, gene B produces black coat color if the genotype is B–, but black pigment is not produced if the genotype is bb. At an independent locus, gene D produces yellow pigment if the genotype is D–, but no pigment is produced when the genotype is dd. Production of both pigments results in brown coat color. If neither pigment is produced, coat color is cream. Determine the genotypes of parents of litters with the following phenotype distributions. Part A...

Nail color in the North American sasquatch is controlled by a single gene with 2 alleles....

Nail color in the North American sasquatch is controlled by a single gene with 2 alleles. The completely recessive allele (n) results in a yellow nail, while the dominant allele (N) results in a black nail. A female sasquatch with black nails mates with a male sasquatch with yellow nails. Two of their 5 offspring have yellow nails. a. What are the genotypes of the male and female sasquatch? How do you know? B. Suppose one of the yellow-nailed...

In a hypothetical breed of dogs, coat color is controlled by two genes. There are six...

In a hypothetical breed of dogs, coat color is controlled by two genes. There are six different coat colors in this breed: black, brown, cream, gray, silver, and tan. Consider the following crosses. Cross 1: Black females from a lineage of all black dogs are crossed with brown males from a lineage of all brown dogs. F1 males and females are all black. When F1 are intercrossed, F2 males and females are black or brown. Cross 2: Black females from...

In Triskelian cats, in the Blondish Galaxy, black coat color is dominant over grey. Coat color...

In Triskelian cats, in the Blondish Galaxy, black coat color is dominant over grey. Coat color is determined by a single autosomal gene with two alleles: B = black coat color; b = grey coat color. The autosomal gene for eye color is hypothesized to assort independently from the gene for coat color. The two alleles are: R = green eye color; r = blue eye color. If a green-eyed black female cat whose mother has a grey coat and...