A lab discovers a recessive mutation in fruit flies that makes them appear hairy, and they...
A lab discovers a recessive mutation in fruit flies that makes them appear hairy, and they breed a true-breeding line of flies with this mutation. A different lab independently identifies a recessive mutation that causes hairy flies. What experiment, and what results, would lead you to conclude that the two mutations occur in the same gene? What results would lead you to conclude that the two mutations occur in two different genes?
A 3rd lab independently discovers a mutant that is also hairy, but unlike at Lab 1 and 2, they are unable to produce a true-breeding line. When they try to cross two hairy flies, 2/3 of the offspring are hairy, and 1/3 have the wildtype phenotype. When they cross a Lab 3 hairy fly to a normal fly, half of the offspring are hairy, and half are normal. What is a possible explanation for these results? What are the genotypes of these two crosses (hairy x hairy, and hairy x normal)?
sorry for the extremely long question!
Homework Answers
Ans1.
The first part of the question, where we have a true breeding line of mutated flies lab 1 and true breeding line of another mutated breed in another lab, can be solved in the following way.
We know that as the disease is due to a recessive mutation then both of the alleles in the mutated ( hairy ) flies.
Exp1.
Now if the mutated fly from the Lab1 is bred with the mutated fly from the Lab2.
Result1.
If in case both the mutation are on the same gene, then in this case all the progenies would be mutated as there would be no unmutated allele of that gene because all the alleles of the same genes are mutated in both the flies.
If the mutations are not on the same gene. Then none of the progenies will be mutated as no progeny would get the mutated form of both alleles of a particular gene.
Ans 2.
The hairy fly in Lab 3 is not a true breeding line and hence must be having one mutated and one unmutated allele of that gene.
Now as they bred two such hairy flies they are able to provide us a result that we get for a dominant trait/mutation.This can also be confirmed by the second test in which they breed the hairy fly with non mutated ones.
All the above evidences show that the mutation in the fly of Lab3 is a dominant trait.
/****************/ The following answer is dependent on the state of mutation ( homogeneous or Heterogeneous) I'll be considering heterogeneous state of mutatio.*************************************/
In case of the Hairy cross hairy breeding
1. Hairy - 3/4
2. Non Hairy - 1/4
In case of hairy cross normal breeding
1. Hairy - 1/2
2. Non-hairy - 1/2
Add Answer to:
A lab discovers a recessive mutation in fruit flies that makes
them appear hairy, and they...
The wings of wild type fruit flies (Drosophila) are full; two recessive mutant strains express a...
The wings of wild type fruit flies (Drosophila) are full; two recessive mutant strains express a different wing structure – one with scalloped wings and the other with reduced wings (smaller than normal). These are caused by two different mutations in the same gene. This gene is called scalloped. The gene symbol for scalloped is sd, where sd+= wildtype wings sd1= scalloped wings and sd2 = reduced wings Reciprocal crosses between the mutant true-breeding strains produced the following results: Cross...
Some fruit flies have an autosomal mutation that causes the recessive white-eyes to appear compared to...
Some fruit flies have an autosomal mutation that causes the recessive white-eyes to appear compared to the wild-type (dominant) red eyes, while others have an X-linked mutation that causes the same varieties. You are presented with two populations of flies in unmarked tubes: one that has the autosomal white-eye mutation, and a population that has the X-linked mutation for white-eye. Assuming you have separated the pure breeding red and white-eyed parents in each population, What is the set of two...
Suppose that a geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to...
Suppose that a geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to shake and quiver. She calls this mutation quiver, qu, and determines that it is due to an autosomal recessive gene. She wants to determine whether the gene encoding quiver is linked to the recessive gene for vestigial wings, vg. She crosses a fly homozygous for quiver and vestigial traits with a fly homozygous for the wild-type traits, and then uses the resulting F1 females...
Required information Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white...
Required information Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A-G). In each strain, the white eye trait is due to an autosomal recessive allele. It is possible all seven strains have mutations in the same gene. Alternatively, they may have mutations in different genes. To determine how many genes are involved in eye color in these flies, pair-wise crosses are performed between each strain. The offspring phenotypes resulting from...
In Drosophila, the autosomal recessive brown eye color mutation (b) displays interactions with both the X-linked...
In Drosophila, the autosomal recessive brown eye color mutation
(b) displays interactions with both the X-linked recessive
vermilion mutation (v) and the autosomal recessive scarlet (s)
mutation. Flies homozygous for brown and simultaneously hemizygous
or homozygous for vermilion have white eyes. Flies simultaneously
homozygous for both the brown and scarlet mutations also have white
eyes. Flies that are wildtype at all 3 loci have wildtype eye
color. Flies that are homozygous or hemizygous for the recessive
mutant at only one...
E10 from Brooker: In fruit flies, curved wings are recessive to straight wings, and ebony body...
E10 from Brooker: In fruit flies, curved wings are recessive to straight wings, and ebony body is recessive to gray body. A cross was made berween true-breeding flies with curved wings and pray bodies and flies with straight wings and ebony bodies. The F1 offspring were then mated to flies with curved wings and ebony bodies to produce an F2 generation. A. Diagram the genotypes of this cross starting with the parental generation and ending with the Frencration B. What...
6. In Cross 1, a yellow eyed, long wing fruit fly from a pure breeding strain...
6. In Cross 1, a yellow eyed, long wing fruit fly from a pure breeding strain is mated to a red eye, short wing fruit fly from a pure breeding strain. All of their offspring (F1) had red eyes and long wings. In Cross 2, one of the F1 offspring is mated to a fly with yellow eyes and short wings, and this cross gave the following F2 population: 194 flies with long wings and red eyes, 796 flies with...
There is X-linked mutations in flies in this example. You need to determine the inheritence pattern...
There is X-linked mutations in flies in this example. You need to determine the inheritence pattern of a mutant that causes hairy body. You mate hairy body males with females that are true breeders for normal bodies. All the offspring (F1) have normal bodies. a.) The hairy body is dominant or recessive? b.) What symbol will you use to represent the hairy allele? c.) What symbol will you use to represent the normal allele? d.) Determine the genotypes of the...
genetics: sorted independently and completely linked Analyze the following fruit fly cross. In this cross there...
genetics: sorted independently and completely linked
Analyze the following fruit fly cross. In this cross there are two autosomal traits that are influenced by two distinct genes and the F2 generation came from crossing an F1 male with an F1 female. P: true breeding grey eyed; brown bodied males x true breeding red eyed; black bodied females F1: all offspring are red eyed; brown bodied F2: ? When the Fy flies are allowed to self cross, what percentage of F2...
Answer Choices: A) Only one of the strains has a mutation in an eye color gene....
Answer Choices:
A) Only one of the strains has a mutation in an eye color
gene.
b) Strains C and D have mutations in different genes.
C) Strains C and D have mutations in the same gene.
D) More information is needed to infer the location of
mutations.
! Required information Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A–G). In each strain, the white eye trait is due to...
Suppose that a geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to shake and quiver. She calls this mutation quiver, qu, and determines that it is due to an autosomal recessive gene. She wants to determine whether the gene encoding quiver is linked to the recessive gene for vestigial wings, vg. She crosses a fly homozygous for quiver and vestigial traits with a fly homozygous for the wild-type traits, and then uses the resulting F1 females...
Required information Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A-G). In each strain, the white eye trait is due to an autosomal recessive allele. It is possible all seven strains have mutations in the same gene. Alternatively, they may have mutations in different genes. To determine how many genes are involved in eye color in these flies, pair-wise crosses are performed between each strain. The offspring phenotypes resulting from...
In Drosophila, the autosomal recessive brown eye color mutation
(b) displays interactions with both the X-linked recessive
vermilion mutation (v) and the autosomal recessive scarlet (s)
mutation. Flies homozygous for brown and simultaneously hemizygous
or homozygous for vermilion have white eyes. Flies simultaneously
homozygous for both the brown and scarlet mutations also have white
eyes. Flies that are wildtype at all 3 loci have wildtype eye
color. Flies that are homozygous or hemizygous for the recessive
mutant at only one...
E10 from Brooker: In fruit flies, curved wings are recessive to straight wings, and ebony body is recessive to gray body. A cross was made berween true-breeding flies with curved wings and pray bodies and flies with straight wings and ebony bodies. The F1 offspring were then mated to flies with curved wings and ebony bodies to produce an F2 generation. A. Diagram the genotypes of this cross starting with the parental generation and ending with the Frencration B. What...
6. In Cross 1, a yellow eyed, long wing fruit fly from a pure breeding strain is mated to a red eye, short wing fruit fly from a pure breeding strain. All of their offspring (F1) had red eyes and long wings. In Cross 2, one of the F1 offspring is mated to a fly with yellow eyes and short wings, and this cross gave the following F2 population: 194 flies with long wings and red eyes, 796 flies with...
genetics: sorted independently and completely linked
Analyze the following fruit fly cross. In this cross there are two autosomal traits that are influenced by two distinct genes and the F2 generation came from crossing an F1 male with an F1 female. P: true breeding grey eyed; brown bodied males x true breeding red eyed; black bodied females F1: all offspring are red eyed; brown bodied F2: ? When the Fy flies are allowed to self cross, what percentage of F2...
Answer Choices:
A) Only one of the strains has a mutation in an eye color
gene.
b) Strains C and D have mutations in different genes.
C) Strains C and D have mutations in the same gene.
D) More information is needed to infer the location of
mutations.
! Required information Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A–G). In each strain, the white eye trait is due to...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago