A cross between AaBb and aabb resulted in the following progeny. What does this suggest about the chromosome location of A-a and B-b? (independent, completely linked, incompletely linked) 27 AaBb 26 Aabb 23 aaBb 24 aabb

answer

watching

108

views

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

You have 0 free answers left.
Get unlimited access to 3.8 million step-by-step answers.

Get unlimited access

Already have an account? Log in

Deanna HettingerLv2

28 Sep 2019

Unlock all answers

Get 1 free homework help answer.

Already have an account? Log in

Related questions

If I observe a bed of mussels on the coast of California in which five species live where the abundances of each species are 22 for species #1, 466 for species #2, 719 for species #3, 18 for species #4, and 2,699 for species #5, what is the probability that I would randomly pick the third species?

(answer to 2 decimal places)

QUESTION 12

Which of the following calculations require that you utilize the addition rule?

A) Calculate the probability of a child having either sickle-cell anemia or cystic fibrosis if parents are each heterozygous for both

B) Calculate the probability of each of four children having cystic fibrosis if the parents are both heterozygous.

.

C) Calculate the probability of children with both cystic fibrosis and polydactyly when parents are each heterozygous for both genes

D) Calculate the probability of purple flower color in a plot of 50 plants seeded from a self-fertilizing heterozygous parent plant

Calculate the probability of black offspring from the cross AaBb Ã AaBb, when B is the symbol for black

amberelephant141

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 âmysteryâ 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?

cyansnail823

a. in drosophila's autosomal gene T there are two alleles: T andt. when the reccecive t allele is homozygous, it turns femaledrosophila (XX) into male (phenotypeically only). all those "males"are futile. allele t has no effect on XY male. an hybridization isconducted between heterozygote female for T gene and homozygotemale to the reccecive gene at the same locus. what is the ration ofall the siblings in F2?

b. in an autosomal gene A in drosophila there are 2 alleles: A,a. this gene is lethal when alleles are homozygote. drosophila hasalso an autosomal gene B which is indipendent on A. when B dominantallele is homozygote, it prevents the death of AA siblings only.what will be the siblings ration on the following hybridization:AaBb x AaBB

c. explain what does "Mendelian traits"means