Please explain your choice: Consider an individual with genotype A/a B/b C/c D/d, descended from one parent with genotype A/A B/B C/C D/D and another parent with genotype a/a b/b c/c d/d. Assume that genes A, B, C, and D are present in this particular order on the same chromosome. What is the minimum number of crossovers that must take place on that chromosome for the individual to generate a gamete with genotype AbCd? (hint: draw homologous chromatids and the crossovers that are taking place between them)

In corn, the genes that determine seed color and coat are both located on chromosome 9.  Seed color (C) can be colored or colorless, where colored seed is dominant and seed coat (W) can be waxy or unwaxy, where waxy is dominant.  A strain that was heterozygous for both genes was crossed with a plant that was homozygous recessive for both genes.  The resulting F1 progeny is described below: colored, waxy seed                17 colored, unwaxy                    33 uncolored, waxy seed           32 uncolored, unwaxy seed       18 The arrangement of alleles in P generation was?

in a cross AaBb X aabb, the following progeny were obtained: AaBb=50 aabb=46 Aabb=7 aaBb=6  What is the recombination frequency between the genes A and B? How far apart are they if they were on the same chromosome

Consider the following Test Cross results & chromosome map: Test Cross Progeny 525 A   B  C 500 A+ B+C+ 456 A+ B C 308 A  B+C+ 101 A  B  C+ 100 A+ B+C 2 A+ B C+ 1 A  B+C Total Progeny = 1993   1-Based on the above data calculate the expectednumber of Double crossovers (DCOs)? Round answers to the closest whole number.

Consider two genes A and B. If there are on average 1.5 crossovers taking place between A and B, what is the map distance between A and B? Enter your answer in map units. NB: no partial credit will be given for answers not expressed in man units

Assume that the loci are all independent and that the allele represented by the upper case letter is completely dominant to the allele represented by the lower case letter. Assume that there is no epistasis. Referring to the cross: AaBbCCDd x aaBBccDD How many different phenotypes are expected to be found in the progeny of this cross? Answer:

A cross is made between AaBbCc and aabbcc plants, and the offspring occur in the following numbers: 30 aaBbCc 15 aaBbcc 30 aabbCc 15 aabbcc 15 AaBbCc 30 AaBbcc 15 AabbCc 30 Aabbcc What is the arrangement of alleles on the homologous chromosomes of the heterozygous parent? Include map units.

The genes F and G are on the same chromosome in a eukaryote. Using a microscope, you can see that a chiasma occurs between these two loci in 24% of the meioses. A double heterozygote could have genotype FG//fg, where the // represents the pair of homologous chromosomes that contain the F and G loci: one homolog contains F and G alleles and the other contains f and g. You cross this FG//fg individual to an fg//fg individual and examine their offspring. What proportion of the offspring do you expect to be Fg//fg? Group of answer choices 48% 6% None of these 12% 24%

The image shows a pair of homologous chromosomes from a single parent before gamete production. M1 and M2 are maternal chromosomes, while P1 and P2 are paternal chromosomes. Two traits are shown: D represents seed color (D – green, d – yellow), while F represents flower color (F – purple, f – white). These two traits follow the patterns of basic Mendelian genetics. During crossing-over between the M2 F allele and the P1 f allele, a mutation occurred and the portion of P1 did not reattach to the chromosome. Which of the following explains what would happen to the proportion of white flowers in a population resulting from this mutation? A - There would be an increase in the proportion of white flowers because the f allele is distributed to more gametes. B - There would be a decrease in the proportion of white flowers because the f allele is not distributed to as many gametes. C - There would be an increase in the proportion of white flowers because the f allele would not be masked by the…

The rate of crossing over between two linked genes (r and w) is 0.44. The following cross is carried out: Rr Ww × rr ww. What proportion of the gametes of the Rr Ww parent were recombinant gametes? Explain your reasoning and state any assumptions you made.