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Worksheets1005MSC Week 4
Total questions: 15
Worksheet time: 24mins
A polygenic trait means...
One genotype determines one phenotype
One gene can have multiple phenotypic effects
Multiple genes contribute to one phenotype
Multiple people have the same gene
Which of the following is autosomal dominant?
Sickle Cell Anaemia
Cystic Fibrosis
Duchenne Muscular Dystrophy
Huntington's Disease
If a disorder is autosomal recessive, what is the probability of two heterozygotes having an affected child?
0%
25%
50%
75%
100%
What are genes that are located near each other on the same chromosome, causing them to be inherited together?
Homologous Chromosomes
Linked Genes
Sister Chromatids
Doesn't Exist
Which of these are not polygenic?
Height
Skin Colour
Cystic Fibrosis
Eye Colour
In a testcross, what genotype is the unknown parent crossed against?
Homozygous Dominant
Homozygous Recessive
Heterozygous
Identical
What ratio do you expect from testcrossing someone heterozygous for 2 traits?
9:3:3:1
12:1:1:1
6:4:4:1
1:1:1:1
For a sex linked recessive disorder, if a father is affected and a mother is homozygous dominant, what is the probability a son is affected?
50%
0%
100%
25%
What is the expected ratio for a dihybrid cross of two heterozygotes?
6:4:4:2
9:3:3:1
1:1:1:1
12:2:1:1
Intelligence is considered to be the result of an interaction between many genes, with considerable influence also made by an individual’s environment. How would the genetic inheritance of intelligence be described as? (Select 2 Answers)
Pleiotropic
Epistatic
Polygenic
Multifactorial
Which of the following is true of amniocentesis? (Choose two)
A sample of the chorionic villus is taken
Done during the 14th - 16th week of pregnancy approx
A sample of amniotic fluid is taken
Procedure has a greater risk of miscarriage
Given incomplete dominance, what is the phenotypic ratio when two heterozygotes mate?
3:1
2:2
1:3:1
1:2:1
Which of the following are true about cystic fibrosis? (Choose 2)
Autosomal Dominant
Autosomal Recessive
Failed Chloride Transporters
Failed Glucose Transporters
Which of the two following are exhibited by the ABO blood groups system?
Complete Dominance
Incomplete Dominance
Co-Dominance
Fake Dominance
A mother is a carrier for a sex-linked recessive disease. Her son and daughter are both found to have the disease. What is the father's genotype? (Xd = recessive, X = dominant)
Xd Xd
XXd
Xd Y
XY
