how geneticists perform association mapping, we need first to examine how variants at different sites across the genome tend to be organized with respect to each other in natural populations

How can you use this piece of information to help you explain to your friends what is the significance of mutations in the emergence of new genetic properties (alleles) that may result (or not) in new phenotypic characteristics? (Recall that not all SNPs affect phenotype.)

Can you always ascertain an organism ‘s genotype for a particular locus if you know its phenotype? Conversely, if you are given an organism’s genotype for a locus, can you always reliably predict its phenotype? Explain.

in a randomly mating laboratory population of Drosophila, 4% of the flies have black bodies, and 96% have brown bodies. Flies with brown bodies always have at least one parent with a brown body. What is the frequency of heterozygotes in this population?     0.04     0.16     0.08     0.32   The period gene of Drosophila melanogaster encodes for a stretch of Thr-Gly repeated in tandem. In natural populations, the three most common alleles encode for 17, 20 and 23 Thr-Gly repeats.  The amplification by PCR of the allele encoding for 20 Thr-Gly repeats produces a fragment of 320 bp. Using the same set of primers, what is the size expected when amplifying the 17 Thr-Gly allele?     317     303     314     302       in a certain species of plant loci A, B and C have an additive effect on the colour of the flower. Alleles A, B, and C are dominant and alleles a, b and c are recessive.  Knowing that a plant with genotype AAbbCc has a…

Which one of the following options most accurately describes how the ~3000 megabases (Mb; ~3,000,000,000 nucleotides) of the haploid human genome are distributed on chromosomes? The haploid human genome is distributed on autosomes 1-22 and X and Y (so, 24 chromosomes). The haploid human genome is distributed on the homologous pairs of autosomes 1-22 and X and Y (so, 46 chromosomes). The haploid human genome is distributed on a single chromosome (so, 1 chromosome). The haploid human genome is distributed on one pair of homologous chromosomes (so, 2 chromosomes).

A. How does the linkage of traits impact selection decisions in a breeding plan?   B. How are molecular markers useful for making selection decisions in the face of linkage drag?

Explain Using temperature-sensitive alleles for time-of-function analysis?

Genes A and B are 7.5 map units apart on one chromosome. Genes C and D are 8.0 map units apart on a second non-homologous chromosome. • The recombination frequency between A and B is? • The recombination frequency between A and C is? • The recombination frequency between C and D is? • The recombination frequency between B and D is?

How the Chi-Square Analysis Evaluates the Influence of Chance on Genetic Data ?