BIO 340 Examinable Questions And Revised Answers
Loss of Heterozygosity - answersCan mask deleterious recessive alleles (Aa)
Can hide an undesirable trait if there is a dominant gene present
Gregor Mendel - answersAmateur botanist explains heredity in plants 1866, law of segregation, ind...
Loss of Heterozygosity - answers✔✔Can mask deleterious recessive alleles (Aa)
Can hide an undesirable trait if there is a dominant gene present
Gregor Mendel - answers✔✔Amateur botanist explains heredity in plants 1866, law of
segregation, independent assortment, and domanince.
Traits are transmitted from parents to offsprings in specific patterns
Law of Segregation - answers✔✔Each inherited trait is defined by a gene pair (diploid).
Parental genes are randomly separated to the sex cells so they only contain one gene of that
pair. Offsprings only inherit one allele from each parent.
Works with a monohybrid
Ex: Tt x TT
Law of Independent Assortment - answers✔✔Genes for different traits are sorted seperately
from one another.
Independent works with dihybrid crosses.
Ex: TtRRDd x ttRrdd
Law of Dominance - answers✔✔When parents with pure, contrasting traits are crossed
together, only one form of the trait appears in the next generation.
Frederic Griffith (bacterial transformation) - answers✔✔(Transforming principle) where R-
strain bacteria turned into S bacteria
Avery - Macleod - McCarty Experiment - answers✔✔Determined that DNA is the
transforming factor
Hershey - Chase Experiment - answers✔✔Determined DNA is the genetic material
DNA Nucleotides - answers✔✔Deoxyribose (5 carbon sugar), phosphate group, 1 of 4
nitrogenous bases
Adenine (A)
Thymine (T)
Guanine (G)
Cytosine (C)
Purines/Pyrimidines - answers✔✔Purines (A & G): larger molecular structure with a shorter
name
Pyrimidines (T & C): small molecular structure with longer name
A purine has to be paired with a pyrimidines
Meselson - Stahl Experiment (1958) - answers✔✔Demonstrated that replication was
semiconservative using heavy isotope nucleotides
DNA Replication - answers✔✔All polymerase systhesis in a 5'-3' is read 3'-5'
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