Topic 3 & 10 Review IB Bio Genetics

Which of the following chemicals is a component of eukaryotic chromosomes?

• Triglyceride
• Fatty Acid
• Protein
• RNA

What do all human males inherit from their mother?
I. An X chromosome
II. A Y chromosome
III. Mitochondrial DNA

• I and II only
•  II only
•  I and III
• I, II and III

Which of the following statements about homologous chromosomes is correct?

• Each gene is at the same locus on both chromosomes
• They are two identical copies of a parent chromosome which are attached to one another at the
  centromere
• They always produce identical phenotypes
• They are chromosomes that have identical genes and allele

What does the karyotype below correspond to?

• normal male
• A normal female
• A female with Down syndrome
• A male with Down syndrome

What can be concluded from the karyotype provided below?
 

• There was non-disjunction during meiosis in the mother
• There was non-disjunction during meiosis in the father
• The fetus is male
• The fetus is female

In the following diagram, which pair represents homologous chromosomes...

• 1 & 2
• 3 & 4
• 2 & 5
• 4 & 6

3.1- What is the difference between the alleles of a gene?

• Their position on the chromosome
• Their amino acid sequence
• Their pentose sugars
• Their base sequence

3.1- What is the set of alleles that an individual possesses?

• A gene
• A genotype
• A genome
• A genus

3.1- A human cell has between 20 000 and 25 000 genes whereas an E. coli cell has approximately 4000 genes. Which of the following statements is true?

• The human genome is larger than the E. coli genome
• There are more genes on each human chromosome than on the E. coli chromosome.
• The human cell and the E. coli cell produce approximately the same variety of proteins
• The DNA in both organisms is associated with histones (proteins).

What are the fundamental structural units of eukaryotic chromosomes?

• Histones
• Nucleoids
• Nucleosomes
• Centromeres