Question 2 (5 pts). In roses, two gene loci on an autosomal chromosome are 30cM from...

Question 2 (5 pts). In roses, two gene loci on an autosomal chromosome are 30cM from each other. At locus 1, the E allele for red flower color is completely dominant to the e allele for pink flower color. At locus 2, the G allele for thorns is completely dominant to allele g for thornless. A particular rose cultivar, true-breeding for red flower and thorns, is crossed to cultivar 2, true-breeding for pink flowers and thornless. The F1 generation is testcrossed with cultivar 2 and 300 testcross progeny are produced.

What is the expected frequency of gametes of genotype EG produced by the F1-generations plants?

When the F1-generation plants produce gametes, what is the expected frequency of recombinant gametes?

In the testcross progeny, how many plants are expected to have pink flowers and be thornless?

In the testcross progeny, how many plants are expected to have pink flowers and thorns?

e. If the two loci were not linked, and segregated independently from each other, how

many plants would be expected to have pink flowers and thorns in the testcross progeny?

Solutions

Expert Solution

a). 35%

b). Recombinant gametes = 30%

Distance between the genes (cM) = Recombination frequenc (%)

c). Pink, thornless---35%

d). Pink, thorn-15%

e). Pink flowers and thorns = 25%

If the genes are not linked and assort independently, all phenotypes are produced in equal proportions.

Explanation:

Red, Thron (EG/EG) x Pink, Thornless (eg/eg)---P1

EG/eg(red, thorn)-------------------F1

F1 x eg/eg (tester)----------------------------------Testcross

EG/eg x eg/eg

	eg
EG (35%%)	EG / eg(35%%)—Red, thorn
Eg(15%)	Eg / eg( (15%)---Red, thornless
eG(15%)	eG / eg( (15%)---Pink, thorn
eg(35%)	eg / eg( (35%)---- Pink, thornless

If the genes are not linked….

EG/eg x eg/eg

	eg
EG (25%)	EG / eg(25%%)—Red, thorn
Eg(25%)	Eg / eg( (25%)---Red, thornless
eG(25%)	eG / eg( (25%)---Pink, thorn
eg(25%)	eg / eg( (25%)---- Pink, thornless

gladiator answered 1 year ago

Next > < Previous

Related Solutions

2) A box contains 4 red roses and 5 white roses. If two roses are randomly...

2) A box contains 4 red roses and 5 white roses. If two roses are randomly selected without replacement (this means that when the first rose is removed it is not returned to the box), find the following probabilities: a) The probability that both selected roses are white. b) The probability that at most one white rose is selected. c) The probability of not selecting any white rose.

Question 1 (10 pts). The genetic linkage among 3 gene loci in horses is being studied....

Question 1 (10 pts). The genetic linkage among 3 gene loci in horses is being studied. The loci are part of autosomal chromosomes and they MIGHT be on the same pair of homologous chromosomes. There are two alleles at each locus. At the coat color locus, allele B is for black, and b is for white. At the height locus, allele H is for tall, and h is for short. At the tail locus, allele T is for long, and...

Question 15 - Cystic fibrosis is transmitted as a(n): X-linked recessive gene autosomal recessive gene autosomal...

Question 15 - Cystic fibrosis is transmitted as a(n): X-linked recessive gene autosomal recessive gene autosomal dominant gene chromosomal defect

(5) (15 pts) FIS and FST (a) A SNP on human chromosome 2 (rs4988235) has the...

(5) (15 pts) FIS and FST (a) A SNP on human chromosome 2 (rs4988235) has the following allele frequencies in 4 human populations: 0.590 in Finland 0.080 in Italy 0.000 in Yoruba 0.000 in Japan Given these data, compute FST for this SNP. (b) Another SNP on human chromosome 6 (rs4707151) has the following allele frequencies in 4 human populations: 0.323 in Finland 0.384 in Italy 0.229 in Yoruba 0.087 in Japan Given these data, compute FST for this SNP....

Question text In drosophila (fruit flies): The yellow gene is on the X-chromosome, the gene product...

Question text In drosophila (fruit flies): The yellow gene is on the X-chromosome, the gene product plays a role in body colour. Wild type flies are a light brown/tan in colour, homozygote yellow mutants have a more yellow shaded body colour. We'll use y+ to represent the wild type allele, and y to represent the mutant allele. y+ is dominant to y. The vestigial gene is on chromosome 2. Homozygote vestigial mutants have very short wings, and cannot fly. We'll...

Question #2 (5 pts): Compare the G proteins that acts in transducing the signal from b-adrenergic...

Question #2 (5 pts): Compare the G proteins that acts in transducing the signal from b-adrenergic receptors, and Ras. What properties do they share? How do they differ? What is the functional difference between Gas and Gai?

Insulin-like growth factor 2 receptor (Igf2r) gene is expressed exclusively from the maternal allele on chromosome...

Insulin-like growth factor 2 receptor (Igf2r) gene is expressed exclusively from the maternal allele on chromosome 17 due to A. differential methylation of an Igf2r intron. B. differential expression of an antisense RNA transcript. C. transposition of the maternal copy of Igf2r. D. methylation of an imprinting control region.

5. The eye color gene in fruitflies is located on the X chromosome. The dominant wild-type...

5. The eye color gene in fruitflies is located on the X chromosome. The dominant wild-type X^+ allele produces red eyes, while the recessive XW allele produces white eyes. In addition, sex is determined in fruitflies by the ratio of the number of X chromosomes to number of sets of autosomes. Imagine that a pure-breeding white-eyed female with the genotype X^W X^W Y AA mates with a pure-breeding red-eyed male who has the genotype X^+ Y AA. Imagine that nondisjunction...

5. A kidney-bean shaped eye is produced by a recessive gene, k, on the third chromosome...

5. A kidney-bean shaped eye is produced by a recessive gene, k, on the third chromosome of Drosophila. Orange eye color, called cardinal, is produced by the recessive gene cd on the same chromosome. A third recessive gene on chromosome three, e, produces ebony body color. Trihybrid females are testcrossed to produce 4000 progeny, as follows: 1761 kidney, cardinal 1773 ebony 128 cardinal 97 kidney 89 ebony, cardinal 6 kidney, ebony, cardinal 8 wild type 138 kidney, ebony a. Which...

An autosomal gene is segregating two alleles, R and r, with respective frequencies 0.3 and 0.7....

An autosomal gene is segregating two alleles, R and r, with respective frequencies 0.3 and 0.7. If mating is random, what are the expected frequencies of the genotypes? Now suppose that every individual in the population mates with a sibling. What will the genotype frequencies be among the offspring? Suppose instead that every individual mates with a first cousin. What will the genotype frequencies be among their offspring? Finally, suppose that after many generations of random mating, every individual in...

Subjects