THE GENES A, B AND C ARE LINKED ON CHROMOSOME 2 OF S. CEREVISIAE. IN A SERIES OF TWO-POINT MAPPING CROSSES, THE GENETIC DISTANCES SHOWN BELOW WERE DETERMINED. WHAT IS THE GENE ORDER? A-C: 28 A-B: 16 B-C: 41 A-B-C B-A-C A-C-B

You would like to create new hybrid strains between various cereal grains of different ploidies. Which of the following crosses will yield a fertile hybrid? Select all correct answers. (note that tri=3, tetra=4, penta=5, hexa= 6, and octa=8) 0 0 0 0 pentaploid X triploid tetraploid X diploid octaploid X diploid hexaploid X diploid

The Pipsy (P) gene can be found on chromosome 6 alongside 3 other genes D, G and T. Based on the recombination frequencies shown below, construct a chromosome map. Please indicate your answer in the following format: ABCD (where the genes are laid out on the chromosome as ABCD).  P-D: 5 G-T: 25 D-T: 13 D-G: 12 G-P: 17

Recombination frequencies have been determined between four genes (A, B, C and D) as follows: A-B: 20%, B-C:  50%, A-D: 50%, C-D: 5% Which of the four genes is/are likely linked on the same chromosome?

Two strains of   S. cerevisae (yeast) are crossed. One has the genotype   A B and the other   a b. Which statement correctly describes the tetrads that can be produced by one reciprocal exchange between the   A and   B genes without gene conversion in the dihybrid?             A)   Recombination occurs at the four-strand stage to produce a tetrad with   A B, A B, a B, and   a b chromosomes.                        B)   Recombination occurs at the four-strand stage to produce a tetrad with   A B, A b, a B, and   a b chromosomes.            C)   Recombination occurs at the two-strand stage to produce a tetrad with   A B, A b, a B, and   a b chromosomes.            D)   Recombination occurs at the two-strand stage to produce a tetrad with   A b, A b, a B, and   a B chromosomes.

An individual that is heterozygous for an inversion has the following chromosomes(∗ is the centromere):M N O  P  Q  • R  S  T  Um  n  o t   s  r  • q  p  u  Assume that a crossover occurred between P and Q.  Starting with “M” allele, list the remaining genes in order (NO spaces between the letters) of the chromosome resulting from crossing over. You must use upper and lower-case letters correctly and the * symbol for the centromere(s).

In this test cross of AaBbCc you got these results: 100 АВС 100 abc 100 ABC 100 abC 25Abc 25ABC 25 аBС 25 аВс a) Which two genes are linked? Show or explain how you know. b) How far apart are those genes?

Below are two pictures of perithecium on microscope slides that have been squished under cover slips so that the asci inside have spread out. In the asci, we can clearly see the tan ascospores (light colored) and wildtype ascospores (dark colored). We will perform our tetrad analysis by counting how many of the asci are non-recombinant and how many of the acsi are recombinant. We can tell which are recombinant and non-recombinant by observing the patterns of the ascospores in the asci. See the patterns of ascospores for non- recombinant and recombinant asci in the table below. Ascospore pattern of non-recombinant asci OOOO OOOOO You will count the total number of non-recombinant and recombinant asci in the two pictures below. You will only count the asci that have a star next to them because these asci can be clearly identified as non-recombinant or recombinant. Select the correct number below after you are done. Total number of non-recombinant asci [Select] Ascospore pattern of…

The image shows the genetic code of an organism before and after the occurrence of a spontaneous error during chromosomal crossover. G-T-G-C-C-A-T-C-A → G-T-G-T-C-A Based on the information provided, which type of mutation most likely occurred? O deletion O nondisjunction O substitution O translocation

In linkage mapping, how do we measure the distance between genes on a chromosome?  options:   A) The number of gametes used is proportional to the percent recombination in offspring.   B) The number of offspring produced is equal to the percent recombination during crossover.     C) The number of chromosomes resulting from crossover is equal to the distance the genes are apart in any one gamete.   D) The percentage of recombinant offspring is directly proportional to how far apart the genes are on the chromosome.