Log in
Biology
2
answers
0
watching
12
views
23 Nov 2019

Two gene loci, A and B, assort independently, and alleles A and B are dominant over alleles a and b. Indicate the probablilities of producing .... an AB phenotype from a cross AaBb x AaBb. Not sure if I did this correctly but my answer came out to :1/4 x 1/4 = 1/16

Watch
2
answers
0
watching
12
views

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

Unlock all answers

Get 1 free homework help answer.
Get unlimited access
Already have an account? Log in
Share
Lelia Lubowitz
Lelia LubowitzLv2
3 Nov 2019
Get unlimited access
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
Concepts of Biology
OER Edition,
Openstax
ISBN: 9781938168116
Biology
2nd Edition, 2013
Openstax
ISBN: 9781947172517
Essentials of Biology
5 Edition,
Mader
ISBN: 9781259660269

Related questions

Please show work! thanks

6. Brown hair (A) is dominant over blond hair (a), and browneyes (B) are dominant over blueeyes (b).

6a. Using a single dihybrid Punnett Square show a

ll the possible genotypes of the offspring from a

father with the genotype AaBb and a mother with the genotypeAaBB.

6b. What is the expected phenotypic ratio of the F1offspring?

7. ANSWER THE FOLLOWING QUESTIONS USING THE RULES OFPROBABILITY

7a. In the cross AaBb x AaBb what proportion of the F1 areexpected to have the genotype AAbb?

7b. In the cross AaBb x Aabb what proportion of the F1 areexpected to have the dominant phenotype for BOTH traits?

7c. In the cross AaBbCc x AabbCc what proportion of the F1 areexpected to have the genotype aa?

7d. In the cross AaBbCc x AabbCc what proportion of the F1 areexpected to have the genotype AabbCC?

8. A black and white mouse mate and have 8 healthy grey mice.What would be the expected

phenotypic ratio of the offspring resulting from two greyparents?

9. Bob has blood type A. Frank has blood type AB. Mary has bloodtype B. Mary's child

(Sabrina) has blood type O.

9a. If Mary and Frank have children would be the possible bloodtypes of their children?

9b. Which male (Bob or Frank) could possibly be the father ofSabrina?

10. Hemophilia is a recessive sex-linked human blood diseasethat leads to the failure of blood to clot

normally. What proportion of the sons are expected to havehemophilia if the mother is a carrier

and the father has hemophilia? What proportion of the daughterare expected to have

hemophilia?

Question:

If a female animal with genotype A/A. b/b (the back-slash indicates the chromosome) is crossed with a male that is genotypically a/a. B/B and the F1 is testcrossed, determine the percentage of the progeny from the testcross that will be a/a. b/b, if the two genes are:

a. Unlinked (Show your work).

Answer: AaBb X aabb AaBb – ¼ aabb - ¼ aaBb - ¼ Aabb - ¼ OK

b. Completely linked, i.e., no crossing over at all (Show your work).

Answer: With completely linked genes without crossing over, the only genes possible are AB and ab gametes.

Result:

Therefore the only possibility of having homozygous aabb is 50%.

No; a b is recombinant; please redo

c. 10 mp units apart (Show your work).

Answer: If the linked genes are 10 map units apart, 10% of the results would be recombinants. As F1 progeny ab is part of the parental class, only half of the total parental genotypes will be present. Therefore: 45%

No; a b is recombinant; please redo

d. 24 map units apart (Show your work).

Answer: Same rule applies for c. Therefore the percentage of progeny would be equal to 38%.

No; a b is recombinant; please redo

This is all the information given and need help. I've answered the question and my prof says the answers for b c and d are wrong. Could you please help me out? and also could you explain with the answers? Thank you.

Problem A. You cross two homozygous parents: RRYY (round yellow) and rryy (wrinkled green) to produce an F1 generation. Round seeds are dominant, yellow seeds are dominant. You cross two F1s to produce the F2 generation. In the F2 generation, you find an individual with round yellow seeds. You do a testcross to find out the genotype of this “mystery” dominant/dominant phenotype. In the offspring of the cross, you find 1?2 have round yellow seeds and 1?2 have wrinkled yellow seeds.
1. Based on these data what was the genotype of the mystery F2?

Problem B. You carry out a dihybrid cross between a red-flowered rose with long pollen grains (A1A1 LL) and a white-flowered rose with round pollen (A2A2 l l). The flower color gene (A) shows incomplete dominance, and long pollen is completely dominant to round pollen. The genes for these traits are on different chromosomes so assort independently
2. What would be the phenotypes of the F1 generation?
3. What fraction of the F2 generation is expected to have red flowers and long pollen? (As always when traits are independent, what rule can you apply to save time?)

Problem D. In the example of epistasis presented in class, the agouti allele in mice (A) codes for striped hairs and is dominant to the allele for all black hairs (a). A loss-of-function allele for the pigment gene (b) produces no pigment and is recessive to the normal, dominant allele (B). The recessive allele at b masks the effect of the A gene. A dihybrid cross of AABB and aabb is carried out.
5. Name all of the genotypes in the F2 generation that can produce an albino (no pigment) phenotype.

Problem E. A cross is made between homozygous fruit flies that differ for eye color (the st gene) and
body color (the e gene). The F1 double heterozygote is shown below using chromosome notation.
st+ e
--------------------------------------
st e+
st = the recessive allele for scarlet eyes; st+ = the dominant wildtype allele for red eyes e = the recessive allele for ebony body; e+ is the dominant wildtype allele for gray body

6. Are the chromosomes shown in the genotype above in cis or trans configuration?
7. Based on this notation, what were the genotypes and phenotypes of the two parents of the F1? (Think carefully here...)
8. With what phenotype would you cross this F1 to measure recombination frequency?

Weekly leaderboard

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