ANSC 340 QUIZZES 1-10

ANSC 340 QUIZZES 1-10 which to mechanisms both contribute to genetic diversity - ✔✔meisosis crossing over You have decided to spend money to have all of your potential breeders tested for the presence of a lethal all ...

ANSC 340 QUIZZES 1-10 which to mechanisms both contribute to genetic diversity - ✔✔meisosis crossing over You have decided to spend money to have all of your potential breeders tested for the presence of a lethal allele. You then breed only those who tested negative. This is an example of: - ✔✔marker assisted selection The mating of an individual with a dominant phenotype to one that is a known homozygous recessive id termed as: - ✔✔testcross ______ mating is the mating amongst generation - ✔✔inter se _____ is the mating of an F1 to an individual from one of the pure breeding strains used to create the F1 - ✔✔backcross phenotype ratio you would expect from a dihybrid cross - ✔✔9:3:3:2 are mammalian gametic cells diploid - ✔✔no, haploid a missense mutation is one that codes for a premature stop - ✔✔false, non-sense What is the simplest (3 word) explanation of Mendel's Law of Segregation - ✔✔alleles sort randomly genes on sex chromosomes are referred to as - ✔✔sex-linked in the horse, the mare is the homogametic sex - ✔✔true in the chicken, the hen is the homogametic sex - ✔✔false (male) The failure of chromosomes to separate properly during meiosis is known as: - ✔✔nondisjunction In humans, this is a relatively common example of the phenomenon described in the previous question: - ✔✔down syndrome Calico coloring in a male cat is extremely rare. What must occur (in terms of the cat's genotype) for a male cat to be calico? - ✔✔-nondisjunction at the sex chromosome and presence of the spotted allele must occur In the case of codominance and two alleles, how many distinct phenotypes are there? - ✔✔3 scrotal rupture in pigs, a situation where the phenotype is not always expressed, is an example of - ✔✔incomplete penetrance a ____ probability probability is the probability of two or more events occurring together - ✔✔joint the probability the one of any number of mutually exclusive events occur is the ___ of probabililties of each event - ✔✔sum MISSING ONE QUESTION FROM QUIZ 2 - DIDNT WRITE IT DOWN - ✔✔ WE USE A ____ test as a means to test a genetic hypothesis - ✔✔chi-square if we fail to reject the hypothesis that two loci are independent of each other, what can we assume about their location within the genome relative to each other? - ✔✔either: lay far apart on same chromosome, or they are not on the same chromosome The easiest and cheapest way to avoid producing rat-tailed calves is to breed: - ✔✔matching color, black-black, red-red, etc stallion has the genotype AaBb. what are the possible recommbinant genotypes - ✔✔impossible to determine with the information given An AAbb sstallion is mated to an aaBB mare. The offspring was found to have aB and Ab gametes. The gametes are: - ✔✔parental term used to denote recombination frequency - ✔✔theta two loci on the same chromosome segregating together very often (there is little crossing over between the two loci). What is the possible range of theta? - ✔✔0.0 < theta < 0.5 Recombination information can be used to construct a map of the order of loci and relative distance between loci. Maps constructed as such are referred to as ______ maps. - ✔✔linkage a second type of map, constructed on DNA sequence information, is referred to as a _____ map - ✔✔physical if X2 is close to your critical value, you should - ✔✔consider the data inconclusive and gather more data F(Bb)= - ✔✔non of above (options being p, P, Q) q denotes - ✔✔F(b) which describes the frequency of the dominant allele within a populaation - ✔✔p Choose the correct desccription of H-W equilibrium - ✔✔allelic and genotypic frequencies remain unchanged throughout generations what must be absent in order for H-W E to occurr - ✔✔migration Correct description for genetic drift - ✔✔changes in allelic and genotypic frequencies occur faster in smaller populations the effect of aa migration event on the allelic and genotypic frequencies of a population will largely depend on - ✔✔difference in allele frequency between the native and immigrant populations mutation can raapidly affect allelic and genotypic frequencies within a population - ✔✔false Q=q^2 - ✔✔only true in H-W E q=Q + (1/2)H - ✔✔is always true correct interpretation of the phenomenon of "genetic drift" - ✔✔changes in allelic and genotypic frequencies occur faster in smaller populations which statement is true - ✔✔it takes only one generation of outbreeding to permanently increase heterozygosity black or brown coat color is an example of ___ trait - ✔✔simply- inherited and qualitative to dedtect a recessive allele in a possible carrier the most effective way would be to mate it to what genotype - ✔✔none of above (known hetero; homo dom; random selection if particular genotype is being culled out of a population, the relative fitness of thaat genotype is - ✔✔zero if a particular genotype is being culled out of a population, the selection coefficient "S" for that genotype is - ✔✔one in condition of overdominance, equilibrium and never occur - ✔✔falsse what is an assumption of H-W E - ✔✔none of above (selection against recessive alleles; selection for the heterozygote; selection against the dominant allele) which best describes H_W E - ✔✔allelic a