MBG2400 Exam Questions with Complete Correct Answers | Grade A

Pleitropy is when one locus Ans: affects 2 or more traits epistasis is when alleles at one locus Ans: affect the expression of alleles at a different locus linkage is when 2 or more chromosomes are Ans: on the same chromosome P is the frequency of Ans: AA H is the frequency of Ans: Aa 2 Q...

name three factors affecting independence (and F2 ratios) Ans: -pleiotropy -epistasis -linkage What is pleiotropy? Ans: When 1 gene (locus) has more than 1 effect on an individuals phenotype (eg. W allele in cats causes both white fur and deafness) What is epistasis? Ans: a gene at one locu...

What is Methylation? Ans: addition of methyl groups (CH3) to specific DNA nucleotides What performs methylation? Ans: DNA methyltransferases, add primarily to Cytosine bases What bases are primarily methylated? Ans: Cytosine - located in CpG dinucleotides What is a CpG dinucleotide? Ans: side...

Difference between Plant and Animal Life cycle? Ans: Plant(more complex): Start off with a diploid (2 chromosome sets) after the young individual organism undergo meiosis and then we produce haploid (1n) spores then they undergo mitosis that produces a gametophyte (something that is multicellul...

What happens to a chromosome fragment in meiosis that does not have a centromere (aka, acentric fragment)? Ans: It is lost.... Is the outcome the different for the acentric fragment in mitosis? Ans: no What is the consequence of a terminal deletion in meiosis? Ans: gametes are absorbed What ...

using the hardy-weinberg principle, what happens to p and q w/ random mating Ans: nothing, their values don't change when detecting carriers, what happens to P(Bb) and n increases Ans: P(Bb) decreases as n increases, creating a higher level of confidence in detecting a carrier migration Ans:...

What is heritability? Ans: the proportion of variation among individuals that we can attribute to genes What is a quantitative trait? Ans: a measurable phenotype that depends on the cumulative actions of many genes and the environment What is a QTL? Ans: quantitative trait loci What is the g...

Qualitative traits Ans: controlled by one or a few loci; discrete phenotypes (eye colour, coat colour, seed colour, seed texture, blood type, colourblindness etc) Quantitative traits Ans: controlled by multiple loci (also called polygenic traits); continuous phenotypes (height, weight, racing...

When do F2 ratios do not hold? Ans: When 2 loci are not independent What is pleiotropy? Ans: One locus affects more than one trait What is epistasis? Ans: Allele at one ocus that affects the allele on another locus What is linkage Ans: 2 or more loci on the same chromosome What impairment is...