LSC 347-Genetics Exam 1 UPDATED ACTUAl Questions and CORRECT Answers
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Module
LSC 347-Genetics
Institution
LSC 347-Genetics
LSC 347-Genetics Exam 1 UPDATED
ACTUAl Questions and CORRECT
Answers
A 1:1 phenotypic ratio is expected from a monohybrid testcross with complete dominance. -
CORRECT ANSWER- True.
A bivalent at pachytene contains four chromatids. - CORRECT ANSWER- TRUE
A chromosome may contain one or two c...
LSC 347-Genetics Exam 1 UPDATED
ACTUAl Questions and CORRECT
Answers
A 1:1 phenotypic ratio is expected from a monohybrid testcross with complete dominance. -
CORRECT ANSWER- ✔✔True.
A bivalent at pachytene contains four chromatids. - CORRECT ANSWER- ✔✔TRUE
A chromosome may contain one or two chromatids in different phases of the mitotic or
meiotic cell cycle. - CORRECT ANSWER- ✔✔True.
A conditional mutant is one whose expression is influenced by some environmental
condition. - CORRECT ANSWER- ✔✔True.
A condition in which one gene pair masks the expression of a nonallelic gene pair is called... -
CORRECT ANSWER- ✔✔Epistasis.
A gene can have a maximum of two alleles. - CORRECT ANSWER- ✔✔False.
Alleles that are masked by an epistatic locus are said to be hypostatic to the genes at that
locus. - CORRECT ANSWER- ✔✔True.
A mutation in a gene often results in a reduction of the product of that gene. The term for this
type of mutation is... - CORRECT ANSWER- ✔✔LOSS OF FUNCTION OR NULL (IN
THE CASE OF COMPLETE LOSS).
An organism with a diploid chromosome number of 46 will produce 223 combinations of
chromosomes at the end of meiosis. - CORRECT ANSWER- ✔✔True.
An organism with a haploid number of 10 will produce 1024 combinations of chromosomes
at the end of meiosis. - CORRECT ANSWER- ✔✔True.
, A recessive allele in tigers causes the white tiger. If two normally pigmented tigers are mated
and produce a white offspring, what percentage of their remaining offspring would be
expected to have normal pigmentation? - CORRECT ANSWER- ✔✔75%
A situation in which there are more than two alternative forms of a given gene would be
called... - CORRECT ANSWER- ✔✔Multiple alleles.
Assuming complete dominance, a 3:1 phenotypic ratio is expected from a monohybrid sib or
self-cross. - CORRECT ANSWER- ✔✔True.
Assuming no crossing over between the gene in question and the centromere, when do alleles
segregate during meiosis? - CORRECT ANSWER- ✔✔Meiosis 1.
Assume that a mutation occurs in the gene responsible for the production of hexosaminidase
A, such that only about 50% of the enzyme activity is found in the heterozygote compared
with a homozygous normal individual. If heterozygotes are phenotypically normal, we would
say that the mutant allele is recessive to its normal allele. - CORRECT ANSWER- ✔✔True.
Assume that in a series of experiments, plants with round seeds (W) were crossed with plants
with wrinkled seeds (w) and the following offspring were obtained: 220 round and 180
wrinkled. What is the most probable genotype of each parent? - CORRECT ANSWER-
✔✔ONE PARENT IS ww, THE OTHER IS Ww. GIVES 1:1 GENO/PHENOTYPE RATIO.
Assume that a black guinea pig crossed with an albino guinea pig produced 5 black offspring.
When the albino was crossed with a second black guinea pig, 4 black and 3 albino offspring
were produced. What genetic explanation would apply to these data? - CORRECT
ANSWER- ✔✔Albino=recessive. Black=dominant.
A typical epistatic ratio is 9:3:4. - CORRECT ANSWER- ✔✔True.
Because of the mechanism of sex determination, males of many species can be neither
homozygous nor heterozygous. Such males are said to be... - CORRECT ANSWER-
✔✔HEMIZYGOUS.
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