BIO 205 EXAM QUESTIONS WITH
CORRECT VERIFIED SOLUTIONS 100%
GUARANTEED PASS (LATEST UPDATE)
The genetic cause of human albinism is due to? - ANS ✓Mutations that cause
the absence of melanin (absence of TYR can cause lower amounts of melanin)
What makes a genetic model system and efficient one? - ANS ✓- easy to grow
and maintain
- fast life cycle
- can "cross"
- cheap and abundant
What mutation do people with lactose tolerance have? - ANS ✓C -> T =
lactose tolerant, T increases affinity for OCT
Are genes expressed in every cell? - ANS ✓No, muscle cells turn on muscle
specific genes, neurons turn on neuronal specific genes, eye cells must turn on
the right genes to build the eye.
Explain in situ hybridization - ANS ✓- can label it with fluorescent dye and acts
as "probe"
- shows where hybridization takes place
What could a null mutation mean? - ANS ✓- promotor mutation
- premature stop codon
- anything alternating splicing
BIO 205
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BIO
What could a silent mutation mean? - ANS ✓- mutation in intron
- synonymous mutation (GGG -> GGC = code for the same AA)
How could you treat a person with phenylketonuria (PKU)? - ANS ✓- diet
without phenylalanine
- enzyme supplements
- dialysis
- liver transplant
Why is it important to diagnose a patient early? - ANS ✓The earlier you
diagnose, the earlier you can treat and have minor deficits.
What can you predict about the colour of babies with PKU? - ANS ✓Fairer
because they have a reduction of TYR and TYR is a precursor of melanin.
When a phenotype is observable, most null alleles lead to a recessive
phenotype. Why? - ANS ✓Because half is good enough - Haplosufficient
Some rare null alleles lead to a dominant phenotype. Why? - ANS ✓Because
half is not good enough - Haploinsufficient
Why did Mendel's experiments work? - ANS ✓- he used the scientific method
- he used an easy organism to work with (pea plants)
What is Mendel's Law of equal Segregation? - ANS ✓From a monohybrid
cross, each parent has an equal chance of contributing one of the 2 factors. (a
monohybrid cross is a cross between parents who are heterozygous)
What are the ratios for:
a) Y/Y & y/y
b) Y/y & y/y
BIO 205
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