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1 Feb 2019

If the F1 progeny of two purebred organisms (AABB x aabb) were testcrossed, what genotypes and phenotypes would you expect? What principle would you base your expectations on?

If the F1 organisms were selfed, what phenotypic ratio would you expect?

If the phenotypic ratio was 15:1, what might you think is going on?

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Deanna HettingerLv2

3 Feb 2019

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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?

yellowmanatee510

Diagram a cross between a true breeding pea plant that produces yellow seeds (G/G) with one that produces green seeds (g/g). Carry the cross out to the F2 generation. Answer the following questions:

What was the F1 genotype and phenotype?

What kinds of gametes could the F1 individuals produce?

What were the F2 genotypes and phenotypes, and in what ratios would you expect each to occur?

Diagram a cross between a true breeding pea plant that produces round seeds and purple flowers, with one that produces wrinkled seeds and white flowers. (Round and purple are the dominant traits.) Carry the cross out to the F2 generation. Answer the following questions:

What are the P1 genotypes?

What is the F1 genotype and phenotype?

What kinds of gametes will the F1 individuals produce?

What are the F2 genotypes and phenotypes?

What genotypic and phenotypic ratios are expected in the F2 progeny?

Diagram a cross between a true breeding pea plant that produces yellow seeds (G/G) and purple flowers (W/W) with one that produces green seeds (g/g) and white flowers (w/w). Carry the cross out to the F2 generation. Answer the following questions:

What was the F1 genotype and phenotype?

What kinds of gametes could the F1 individuals produce?

What were the F2 genotypes and phenotypes, and in what ratios would you expect each to occur?

Diagram a test cross of the F1 individuals from the question above, with the homozygous recessive parent strain. What genotypes and phenotypes would you expect in the testcross progeny, and in what ratios?

If you had a fruitfly with phenotype A, what test would you make to determine if it was Aa or AA? Explain the different outcomes expected if the fly in question is AA or Aa.

If individuals of genotype AaBbCc are intercrossed:

How many different genotypes can occur in their progeny? How many different phenotypes can occur in the progeny?

orangecrow253

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 â Â¼ aabb - Â¼ aaBb - Â¼ Aabb - Â¼ 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.