IB Biology Genetics SL

Red-green colour blindness is caused by an X-linked recessive allele. In the pedigree chart below which individuals must be carriers of the red-green colour blindness allele?

• Grandparent 1, parent 1

• Grandparent 4 and parent 2

• Parent 1 and parent 2

• Child 2 and child 3

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If the parents in the pedigree chart above had a fourth child who was female, what would be the probability that she was colour blind?

• 50%

• 25%

• 0%

• None of the above

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Cystic fibrosis and Huntington’s disease are inherited conditions in humans. Which row in the table correctly describes the disease causing allele in each case?

• Row A

• Row B

• Row C

• Row D

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following can cause new alleles to form and may lead to genetic diseases?

• Mitosis

• Meiosis

• Radiation

• Variation

Tags

NGSS.HS-LS3-2

What are the enzymes used in the process of gene transfer using plasmids in bacteria?

• DNA ligase and DNA polymerase

• DNA polymerase and Helicase

• Restriction endonuclease and DNA ligase

• Helicase and Restriction endonuclease

Which of the following best defines the term, “gene”?

• a heritable factor that consists of a length of DNA and influences many characteristics

• a heritable factor that consists of a length of mRNA and influences many characteristics

• a heritable factor that consists of a length of DNA and influences a specific characteristic

• a heritable factor that consists of a length of mRNA and influences a specific characteristic

What is the main biological use of comparisons of the number of genes between species?

• It provides information about the size of the nucleus

• It provides information about how closely related different species are

• It gives information about the amount of DNA a species has

• It gives information about the number of genetic diseases in different species

What is the difference between prokaryote and eukaryote chromosomes?

• Prokaryotes have a number of circular DNA molecules while eukaryotes have a single linear DNA molecule

• The prokaryote chromosome is a single circular DNA molecule while eukaryotes have a number of linear DNA molecules

• The prokaryote chromosome is made from plasmid molecules while eukaryotes have a number of linear DNA molecules

• Prokaryotes have a number of circular DNA molecules and eukaryotes have a single linear DNA molecule

The roundworm (Caenorhabditis elegans) has a diploid chromosome number of 12. How many chromosomes would be in a haploid roundworm cell?

• 24

• 12

• 6

• None of the above

Which two processes are used in DNA profiling

• PCR and gel electrophoresis

• Gene transfer and gel electrophoresis

• PCR and a Karyogram

• Gene transfer and PCR