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27 Nov 2019

in tomates the flesh can be either red or yellow. Below is a chart of several crosses and the actual phenotype ratios. Complete the genotype colummns in the table/.

Parent Pheotype Phenotypes of offspring
Redxred possible genotypes of parents ? 75 redyellow possible genotypes for the offspring ?
Redxred possible genotypes of parents ? 61 red, 19 yellow yellow possible genotypes for the offspring ?
Redx yellow possible genotypes of parents ? 68 red yellow possible genotypes for the offspring ?
Yellow x yellow possible genotypes of parents ? 84 yellow yellow possible genotypes for the offspring ?
Red x yellow possible genotypes of parents ? 49 red, 52 yellow possible genotypes for the offspring ?

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Related questions

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?

I would take the time to answer these myself but I have manymidterm exams tomorrow and I'm maxed out on work, No time!!!

Please if anyone can answer these questions with the crossesincluded it would save me so much time. Thanks





4. In the fruit fly,Drosophila melanogaster, the normal wild type has long wingsand red eyes (both are dominanttraits). Recessive forms of these genesresult in vestigial wings and brown eyes. A red-eyed, vestigial winged male is crossed with a brown-eyed,long-winged female. (2 pts)

a) Assuming eachparent is homozygous for the dominant alleles, write out the crossand give the genotype and phenotype of the offspring.

b) If each parent is aheterozygote for the dominant alleles, what are the genotypes,phenotypes and ratios of the potential offspring?


5. In peas, the allelefor tall plants (T) is dominant to the allele for short plants andthe allele for purple flowers (P) is dominant to white flowers(p). Write out the results of the followingcrosses and determine the phenotypic ratios foreach: (4 pts)

a)TtPp x TtPp

b)Ttpp x ttpp

c) ttPpx Ttpp

d)TTpp x ttPP

Canaries: Green (wild-type) Pied phenotype Yellow type

Canaries are popular pets and easy to breed in captivity. Additionally, they display great phenotypic diversity, which allows you to do some interesting genetic investigations with them.

When you take a canary from a true-breeding green strain and cross it with a canary from a true-breeding yellow strain, all offspring display the pied phenotype. Based on this you suspect that this color variation is inherited by a gene with a co-dominant inheritance pattern (showing both phenotypic traits in hybrid phenotypes).

You decide to test this hypothesis. To do so, you take pairs of your hybrid F1 individuals (of pied phenotype), and cross them to produce an F2 generation.

After many dozens of crosses and hundreds of offspring, you arrive at the peculiar ratio of:

3/16 green : 6/16 pied : 7/16 yellow

Which of the following hypotheses are consistent with these data? (Note that not all of these hypotheses are mutually exclusive. Assume that the two genes are independently assorting)

Hint: This problem is very hard to work from the given ratios to what is happening genetically. It is easier to "work backwards" and start with each choice below, and see if you can obtain all or important aspects of the results of your cross when making the assumption that the answer choice is correct.

Select all that apply:

Select one or more:

a. At least one of the genes involved is sex linked.

b. One gene controls production of darker pigment (melanin which appears green when mixed with yellow). A second gene acts as a patterning gene with one allele causing expression and the other non-expression of melanin and when in the heterozygous condition each allele controls melanin expression on different parts of the body so long as the bird's genotype of the first gene allows for the production of melanin.

c. this is a single-gene trait with co-dominance

d. one of the two genes involved displays complete dominance, while the other displays co-dominance.

e. the genes involved are epistatically interacting

f. more than one gene is involved

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