Log in
Biology
2
answers
0
watching
85
views

. In Drosophila, shaven bristles (sv) are specified by a recessive gene. A population of fruit flies was found to consist of 66 wild type flies and 22 with shaven bristles.

a. What is the frequency of the sv allele in this population?

b. What is the frequency of the sv+ allele in this population?

c. Based upon the Hardy Weinberg formula, what proportion of the population is expected to have shaven bristles?

d. Based upon the Hardy Weinberg formula, what proportion of the population is expected to be heterozygous for the gene in question? e. Based upon the Hardy Weinberg formula, how many individuals in this population would be expected to have the genotype sv+sv+?

Watch
2
answers
0
watching
85
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
Sixta Kovacek
Sixta KovacekLv2
28 Sep 2019
Already have an account? Log in
Share

Related textbook solutions

Molecular Cell Biology
8 Edition,
Lodish
ISBN: 9781464183393
Biology: Science for Life with Physiology
6 Edition,
Belk
ISBN: 9780134555430
Biology
2nd Edition, 2013
Openstax
ISBN: 9781947172517
Concepts of Biology
OER Edition,
Openstax
ISBN: 9781938168116
Essentials of Biology
5 Edition,
Mader
ISBN: 9781259660269

Related questions

Chromosome Mapping (determining the relative positions of genes on a chromosome) - This is a two point cross since it involves two loci on a chromosome.

Follow the directions for the crosses below involving 2 traits located together on the same chromosome (Drosophila Chromosome IV): eyeless and shaven bristles. Please only typed answer, no hand-written work or screen shots please.

1. a. Perform a monohybrid cross between a female fly with the eyeless mutation and a male fly with shaven bristles. Show results for the F1 offspring. (NOTE: You will use an F1 female in the next cross.)
ENTER DATA HERE:

Question: Are the phenotypes of the F1 offspring what you would have predicted for this cross: why or why not?

Question: After looking at your F1 offspring, which allele is dominant: wild-type eyes or eyeless? How can you tell?

Question: After looking at your F1 offspring, which allele is dominant: wild-type bristles or shaven bristles? How can you tell?

Draw the Chromosome IV pair of an F1 offspring: (HINT: One chromosome was inherited from the mother, with the eyeless allele at the eye shape location (locus) and the wild-type allele at the bristles locus. The second chromosome was inherited from the father, with the wild-type allele at the eye shape locus and the shaven bristle allele at the bristles locus.)

1. b. Perform a testcross between an F1 female offspring from the previous cross and a new male with both the eyeless and the shaven bristle traits to produce an F2 generation.
ENTER DATA HERE:

Question: What phenotypes are found in the F2 offspring?

Question: Are the phenotypes of the F2 offspring what you would have predicted for this cross: why or why not?

Draw the 2 different Chromosome IV pairings you expected in an F2 offspring: (HINT: The F1 female will donate one or the other of the chromosomes you drew above to each offspring. The new male with both the eyeless and the shaven bristle traits can only donate one type of chromosome, with both mutations.)

Question: What are the 2 phenotypes that would result from the 2 different chromosome pairings you just drew?

Question: What are the other 2 phenotypes that you obtained in your F2 offspring? What process, which occurred during meiosis, was responsible for the creation of these recombinant phenotypes?

Draw a map that shows the map distance (in map units or centimorgans) between the locus for the shaven bristle allele and the locus for the eyeless allele. (NOTE: You need to add the proportion of SV;EY flies to the proportion of wild flies OR add the number of SV;EY flies and wild flies and then divide by the total number of flies. Then multiply either number times 100.)—SHOW ALL CALCULATIONS BELOW

CALCULATIONS:

CHROMOSOME MAP:

There are several different ways to draw maps of the chromosomes. You can draw a simple line graph using a free online graphing tool, such as:

http://www.onlinecharttool.com/

http://nces.ed.gov/nceskids/createagraph/

Or you can simply use your keyboard to create a line with the dash or underline, with the abbreviations for the genes inserted, and then put the map units below, such as:

___________A_____________________B_________

50 map units

You fished 100 drosophila out of your cup of tea this morning! There were 20 white, 70 red, and 10 orange eyed flies. This eye-color trait is controlled by a single locus, with 2 alleles. The red color allele is co-dominant, such that the individuals with orange colored eyes are heterozygotes.

a)What is the frequency of the red eye color allele?
b)What is the expected frequency of orange-eyed flies under Hardy-Weinberg equilibrium?
c)Is this population in Hardy-Weinberg equilibrium?
d) What is a plausible explanation of your result?

Rank the following terms in increasing order of scale accordingto your knowledge of their definitions:

-Locus
-Allele
-Chromosome
-Gene

If 16% of a population expressed a recessive trait, whatpercentage of the gene pool is the dominant allele?

Consider a population of Peach-faced lovebirds where:

65% of all gametes carry a dominant allele (F)for regular plumage (feather colors).

The remaining 35% carry the recessive allele(f) for a plumage with white.

When two heterozygous (Ff) individuals breed,we expect the genotype Ff to account for_____% ofthe new generation.

In the case of a species of sea lions displaying assortativemating (where individuals prefer to mate with individuals that looklike them), the conditions for Hardy-Weinberg Equilibrium are stillmet and supported (T or F)

If 90% of the alleles in a population are dominant, what is theratio of genotypes?


What are genes comprised of?


In the Hardy-Weinberg equation, what does 2pq denote?

Without strong natural selection, recessive alleles willinevitable disappear from a population T or F


If the proportion of sickle-cell sufferers(HbS-HbS homozygotes) in a population is 0.04,according to the Hardy-Weinberg equation, what is the proportion ofsickle-cell carriers (HbS-HbA heterozygotes) in thatpopulation?






Weekly leaderboard

Home
Homework Help 3,900,000
Biology 460,000
Start filling in the gaps now
Log in