A level Biology AQA Unit 7

Which of these taxonomic groups is the smallest?

• Domain
• Genus
• Phylum
• Family
• Order

Who devised the binomial naming system?

• Wallace
• Darwin
• Linnaeus
• Mendel

Which of these have 70s ribosomes?

• Prokaryotes
• Eukaryotes

Which contemporary of Darwin independently developed a theory of evolution?

• Mendel
• Linnaeus
• Herschel
• Wallace

Which of the following is an example of post-translational control of gene expression?

• A non-functional protein produced from edited mRNA
• β-galactosidase activity in Escherichia coli exposed to lactose
• Liver cells beginning glycogenolysis in response to glucagon.
• A Hox gene product acting as a transcription factor for many other genes.

The diagram shows the pedigree of a family carrying the sex-linked allele for red-green colour blindness. From which labelled member of his family did E inherit the allele for colour-blindness?

• A

• B

• C

• D

The deer in a captive population vary in colour. 53 deer are brown and 14 are white. The coat colour of deer is determined by the gene R/r, where the dominant allele R codes for brown and the recessive allele r codes for white. Calculate the frequency of the allele R in the population using the Hardy-Weinberg principle.  $p+q=1$   $p2+2pq+q2=1$  

• 0.21

• 0.46

• 0.54

• 0.79

Fur colour in cats is partly controlled by a gene on the X chromosome. The gene has two alleles, one coding for black fur and one coding for ginger fur. The two alleles are codominant, so a heterozygous cat has patches of black and patches of ginger fur, a pattern called tortoiseshell. When a black female cat was mated with a ginger male, the F1 generation consisted of black males and tortoiseshell females. What phenotypic ratio would be expected in the F2 generation?

• 1 black female : 1 tortoiseshell female : 2 black males
• 1 black female : 1 ginger female : 2 black males
• 1 black female : 1 ginger female : 1 black male : 1 ginger male
• 1 black female : 1 tortoiseshell female : 1 black male : 1 ginger male

Two men who are identical twins marry two women who are also identical twins. Each couple has a daughter. The daughters are more genetically similar than is usual for first cousins. Which statement describes the degree of genetic similarity between the daughters?

• They are genetically different from each other due to independent assortment in meiosis
• They are genetically different from each other due to random mutation.
• They are genetically identical because random mutation is rare.
• They are genetically identical because they share the same parental gene pool.

Skin colour in onions is controlled by two pairs of alleles, S/s and R/r, located on separate autosomes. The allele S is dominant and must be present to allow development of pigment in the onion skin. Onions with genotype ss have white skin. The allele R is dominant and gives a red colour. The allele r is recessive and gives a yellow colour. What is the ratio of phenotypes in the offspring of a cross between plants of genotypes SsRR and ssrr?

• all red
• 1 red : 1 white
• 1 red : 1 yellow
• 1 white : 2 red : 1 yellow