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MBG 2040 / MBG2040 QUIZ 2 ANSWERS

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  • MBG 2040 / MBG2040
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  • University Of Guelph (U Of G )

MBG 2040 / MBG2040 QUIZ 2 ANSWERS Question 1 Inbred lines of self-fertilizing plants are typically homozygous for many genes and are often less vigorous than hybrid lines, this is referred to as: Inbreeding Depression Heterosis Hybrid vigour Allelism Question 2 Fatal Familial Insomn...

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  • February 23, 2022
  • 17
  • 2021/2022
  • Exam (elaborations)
  • Questions & answers

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  • mbg 2040 mbg2040 quiz 2 answers

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  • University of Guelph (U of G )
  • MBG 2040 / MBG2040
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MBG 2040 / MBG2040 QUIZ 2 ANSWERS
Question 1
Inbred lines of self-fertilizing plants are typically homozygous for
many genes and are often less vigorous than hybrid lines, this is
referred to as:

Inbreeding Depression


Heterosis


Hybrid vigour


Allelism

Question 2
Fatal Familial Insomnia is an inheritable prion disease caused by a
mutation in the gene (PrPC) encoding the human prion protein (hPrP).
The mutated allele (PrPSC) codes for a prion protein that replaces the
typical α-helix secondary structure with a β-sheet structure. This
conformational change enables the hPrP to dimerize and form the
protein plaques and neuronal damage characteristic of all prion
diseases. This is an example of:

Haploinsuffcientcy


A Gain-of-Function mutation


A Loss-of-Function mutation


Epistasis

Question 3
Two researchers in separate labs both discover a hairless mouse,
which each proves to be homozygous for a recessive mutation. In a
collaboration to determine if these mutations are alleles of the same
gene these researchers breed the two mice together. They discover
that all of the progeny are also hairless. This suggests that:

There is an epistatic relationship between the two genes controlling hairlessness in mice

, Hairlessness is actually a dominant trait


These mutations are alleles of the same gene


The two separate genes controlling the presence of hair in mice are linked

Question 4
The degree to which a trait is manifested in each individual is called
the:

Expressivity


Penetrance


Variability


Variable Dominance

Question 5
When two or more independently assorting genes influence a phenotype and
the presence of one of the gene alleles has an overriding effect or masks the
presence of the other alleles it is said to be:


Polymorphic


Dominant

Epistatic


Codominant

Question 6
The proportion of individuals with a particular genotype that the
express the expected phenotype is called _ _.

Penetrance

, Variable Dominance


Expressivity


Variability

Question 7
While studying the inheritance of leaf length in a particular plant you
cross a true breeding short leaf plant to a true breeding long leaf
plant and find that all of the F1 progeny have intermediate leaf
lengths. This is most likely an example of:

Incomplete Dominance


Codominance


Incomplete Penetrance


Variable Expressivity

Quiz 2:ML
Question 8
A woman with Type A blood and a man with Type B blood have a child
with Type AB blood, what is the probability that a second child will
also be Type AB?

50%


25%


100%


Not enough information is given in the question

Dominance Series and Pedigrees
Question 9

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