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23 Nov 2019

I have no idea how to do this: two gene loci, A and B, assort independently, and alleles A and B are dominant over alleles a and b. Indicate the probability of producing:an AB phenotype froma cross aabb x AABB

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Related questions

In a series of crosses to look at the relationship of different genes with each other, the following crosses were performed. The numbers of offspring obtained from each cross are shown.

Cross offspring linkage?

AaBb x aabb 20 AaBb, 15 Aabb, 18 aaBb, 17aabb

CcDd x ccdd 54 CcDd 49 ccdd, 98 Ccdd, 101 ccDd

EeFf x eeff 43 EeFf 7 Eeff 42 eeff 5 eeFf

a) For each one, note whether the genes are linked, and if so how closely (in mu); and whether the alleles are present in coupling or repulsion in the heterozygous parent.

b) Which genes are most tightly linked (closest together on the same chromosome)?

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

Here is a question and the answer. I can't figure out how thebook got the answer.

E11. Two genesare located on the same chromosome and are known to be 12 mu apart.An AABB individual was crossed to an aabb individualto produce AaBb offspring. The AaBb offspring werethen crossed to aabb individuals.

A. Ifthis cross produces 1,000 offspring, what are the predicted numbersof offspring with each of the four genotypes: AaBb,Aabb, aaBb, and aabb?

B. Whatwould be the predicted numbers of offspring with these fourgenotypes if the parental generation had been AAbb andaaBB instead of AABB and aabb?

Answer:

A. Becausethey are 12 mu apart, we expect 12% (or 120) recombinant offspring.This would be approximately 60 Aabb and 60 aaBb plus440 AaBb and 440 aabb.

B. Wewould expect 60 AaBb, 60 aabb, 440 Aabb, and440 aaBb.