27 Questions
What does the R allele encode?
Starch branching enzyme (Sbe1)
What is the consequence of the r allele not making Sbe1?
Sucrose and unbranched starch build up, leading to wrinkled peas
Which gene determines the Stay green enzyme (Sgr)?
Y allele
What is the general principle about the relationship between a specific gene and its encoded protein?
A specific gene determines a specific protein, whose activity may affect the phenotype
What is the expected outcome of a dominant allele?
It usually determines a normally functioning protein
What effect does the y allele have on chlorophyll breakdown?
It has no effect on chlorophyll breakdown
What does the y allele fail to make?
Stay green enzyme (Sgr)
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What type of dominance is exhibited when the F1 hybrids display traits of both parents?
Codominance
Which phenomenon results in all progeny being spotted and dotted?
Codominance
What controls the type of sugar polymer on the surface of red blood cells?
Gene I
What type of alleles result in individuals having both A and B sugars on their red blood cells?
Two alleles with different sugars
What determines the type of dominance (complete, incomplete dominance, codominance)?
The type of proteins encoded
Which type of dominance relation does not affect the transmission of alleles?
Complete dominance
What is more complex according to McGraw Hill 24?
Interpretation of phenotype/genotype relations
Which of the following is an example of a disease caused by a recessive allele?
Marfan syndrome
What is the frequency of cystic fibrosis in humans?
1/2,500
In pedigrees with dominant traits, what pattern of inheritance is typically observed?
Vertical
Which disease exhibits a dominant pattern of inheritance?
Neurofibromatosis type I
What is the recurrence risk for each sibling of the proband in autosomal recessive inheritance?
25%
Which of the following indicates that dominance is not always complete?
Incomplete dominance
What phenotype ratios reflect the genotype ratios in incomplete dominance?
1:2:1
Which disease is caused by a completely dominant allele?
Marfan syndrome
Learn about the molecular explanations for Mendel’s pea shape and color traits, including the role of alleles in encoding specific enzymes and their impact on pea characteristics. Access the text alternative for slide images to enhance your understanding.
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