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Genetics (SL & HL)
Test Description: Review questions for Topic 4 (Genetics) from the IB Biology syllabus.
Instructions: Answer all questions to get your test result.
1) Which enzymes are needed to produce recombinant plasmids that are used in gene transfer?
A
DNA polymerase and restriction enzymes
B
Helicase and restriction enzymes
C
DNA polymerase and ligase
D
Restriction enzymes and ligase
2) What constitutes a linkage group?
A
Alleles for the inheritance of ABO blood groups
B
Genes whose loci are on different autosomes
C
Genes carried on the same chromosome
D
Genes controlling a polygenic characteristic
3) A cell with a diploid number of 12 chromosomes undergoes meiosis. What will be the product at the end of meiosis?
A
2 cells each with 6 chromosomes
B
4 cells each with 12 chromosomes
C
4 cells each with 6 chromosomes
D
2 cells each with 12 chromosomes
4) A parent organism of unknown genotype is mated in a test cross. Half of the offspring have the same phenotype as the parent. What can be concluded from this result?
A
The parent is homozygous dominant for the trait.
B
The parent is heterozygous for the trait.
C
The parent is homozygous recessive for the trait.
D
The trait being inherited is polygenic.
5) Which process results in the greatest genetic variation in a population?
A
meiosis
B
cytokinesis
C
natural selection
D
mitosis
6) A cross is performed between two organisms with the genotypes AaBb and aabb. What genotypes in the offspring are the result of recombination?
A
aabb, Aabb
B
AaBb, aabb
C
Aabb, aaBb
D
Aabb, AaBb
7) What is a difference between autosomes and sex chromosomes?
A
Autosomes are not found in gametes but sex chromosomes are.
B
Sex chromosomes are found in animal cells and autosomes are found in plant cells.
C
Sex chromosomes determine gender and autosomes do not.
D
Autosomes are diploid and sex chromosomes are haploid.
8) If red (RR) is crossed with white (rr) and produces a pink flower (Rr), and tall (D) is dominant to dwarf (d), what is the phenotypic ratio from a cross of Rr dd and rr Dd?
A
50% pink, 50% white and all tall
B
3:1
C
1:1:1:1, in which 50% are tall, 50% dwarf, 50% pink and 50% white
D
9:3:3:1
9) What is a possible consequence of two base substitution mutations occurring in the same gene?
A
All of the codons from the first mutation onward are changed.
B
Two amino acids coded for the gene are changed.
C
All of the codons between the two mutations are changed.
D
Amino acids in two polypeptides coded for the gene are changed.
10) If a person inherited an allele with the same base substitution mutation from both parents, what sequences could be altered from normal in the person's cells?
A
Two mRNA base sequences only
B
Two mRNA base sequences and two polypeptide amino acid sequences only
C
One mRNA base sequence only
D
One mRNA base sequence and one polypeptide amino acid sequence only
*select an answer for all questions
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