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Biology Grade 11 Unit 4: Genetics

national exam questions have come from this unit. It runs 67 pages; one careful study pass takes about 5.7 hours, and its difficulty is harder among Biology units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

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4.1 The genetic materials · read p. 108
Not asked in a national paper yet.
4.2 The structure and function of DNA and RNA · read p. 108
Not asked in a national paper yet.
4.2.1 The Structure and function of DNA · read p. 108
  • 2017 E.C., Q33 – All of the following features define a chromosome EXCEPT
  • 2016 E.C., Q78 – Which one of the following statements correctly describes chromosome structure?
  • 2015 E.C., Q31 – Which one of the following statements is correct about the description of the cell theory?
  • 2014 E.C., Q73 – During DNA replication
  • 2013 E.C., Q84 – Consider the DNA molecule containing: Strand 1: T A C G T A Strand 2: A T G C A T What will be the sequence of the new DNA if the DNA replicates semi-conservatively?
  • 2011 E.C., Q7 – What is the function of DNA polymerase?
  • 2010 E.C., Q51 – The type of enzyme used in recombinant DNA technology to spilt a specific sugar phosphate bond in each strand of a DNA double helix is called:
  • 2009 E.C., Q91 – which knowledge about cell biology scientists discover after all the others?
  • 2008 E.C., Q32 – Which of the following events happened before all the others?
4.2.2 The structure and function of RNA · read p. 108
Not asked in a national paper yet.
4.3 The process of cell division · read p. 118
Not asked in a national paper yet.
4.3.1 Cell Division · read p. 118
Not asked in a national paper yet.
4.2.3 DNA replication · read p. 120
  • 2018 E.C., Q41 – What is the primary function of meiosis in organisms?
  • 2018 E.C., Q42 – What happens during the S phase of the cell cycle?
  • 2017 E.C., Q35 – All of the following events occur during telophase I of meiosis I cell division EXCEPT
  • 2016 E.C., Q56 – A student concluded that the stage of meiosis on a prepared slide of plant tissue he observed was Anaphase II. What do you think was the reason to come to this conclusion? Observation of
  • 2015 E.C., Q26 – Which of the following sentences explains how crossing over brings variation?
  • 2014 E.C., Q95 – Which one of the following statements best describes the mechanisms by which meiosis brings about variation? Variation in meiosis is because of
  • 2013 E.C., Q81 – How does crossing over during meiosis bring variation in species? By
  • 2012 E.C., Q20 – Which one of the following statements is true about chromosome? It Is
  • 2008 E.C., Q20 – Which one of the following terms refers to the failure of sister chromatids to separate from one another during anaphase?
  • 2006 E.C., Q35 – Which one of the following is the mechanism by which tow genes located on the same chromosome are separated?
  • 2006 E.C., Q74 – Which of the following types of chromosome mutations gives rise to an extra chromosome?
4.4 Protein synthesis · read p. 127
  • 2018 E.C., Q40 – What is the function of RNA in cells?
  • 2015 E.C., Q28 – What is the central role of tRNA in translation?
  • 2015 E.C., Q25 – Identify the correct statement regarding translation in eukaryotic cells. The
  • 2014 E.C., Q71 – If mRNA brings the code "UGA" into the ribosome
  • 2013 E.C., Q85 – During translation the
  • 2012 E.C., Q22 – Which of the following bases are the triplets of codes in the mRNA That cease translation and the ribosome folds the polypeptide into its Final structure?
  • 2012 E.C., Q28 – If the particular triplet of bases in the sense strand of DNA is AGT, Then the corresponding codon for the transcribed mRNA will be
  • 2012 E.C., Q21 – 24.Consider the following disordered events of transcription l. RNA polymerase crosses a stop sequence in the geme II. RNA polymerase reads the antisense DNA strand and builds mRNA Ill.mRNA molecule detaches from DNA and
  • 2011 E.C., Q8 – Which one of the following is commonly called the code of life?
  • 2011 E.C., Q71 – How many nucleotides are needed to form codons for a protein that is 100 amino acids long?
  • 2008 E.C., Q68 – If a codon on a messenger RNA is UUU, what is the complementary anticodon on the transfer RNA?
  • 2008 E.C., Q2 – Which process produced mRNA during protein synthesis?
  • 2007 E.C., Q43 – What does a restriction enzyme do?
  • 2006 E.C., Q54 – During protein synthesis where in the cell does transcription take place?
  • 2006 E.C., Q64 – In protein synthesis, what is produced during transcription?
  • 2006 E.C., Q56 – Which molecules carry the instruction for protein synthesis?
  • 2006 E.C., Q15 – On which of the following organelles of the eukaryotic cell does protein synthesis take place?
  • 2005 E.C., Q64 – Which processes is held responsible for chronic myelogenous leukemia?
  • 2005 E.C., Q82 – Suppose the amino acid coding region in a mRNAis 1200 nucleotides long, how long is the protein in terms of amino acid number?
  • 2005 E.C., Q63 – Gene silencing is the function of one of the following molecules.
4.5 Mendelian inheritance · read p. 131
Not asked in a national paper yet.
4.5.1 Mendelian crosses · read p. 131
Not asked in a national paper yet.
4.5.2 Monohybrid cross · read p. 133
  • 2018 E.C., Q43 – In a monohybrid cross, when two heterozygous individuals (Tt x Tt) are crossed, what is the expected phenotypic ratio of the offspring?
  • 2017 E.C., Q37 – If you have a pea plant of unknown genotype with a green pod color, you obtained all green pod colors of offspring phenotype after a test cross. What was the unknown genotype of the parent? It was
  • 2015 E.C., Q1 – Which one of the following monohybrid crosses can be a test cross?
  • 2010 E.C., Q36 – If two heterozygous tall pea plants are crossed, how many of the offspring would be phenotypically tall plants?
  • 2009 E.C., Q39 – When Mendel crossed a tall pea plant with a short plant the progeny were all tall what did he obtain when he made the reciprocal cross?
  • 2009 E.C., Q34 – If a heterozygous tall pea plant (Tt) is crossed with a short pea plant(tt) ,what percentage of the progeny is expected to be short?
  • 2009 E.C., Q48 – At which of the following generation of crosses between dominant and recessive homozygote parents are all the progeny heterozygote?
  • 2008 E.C., Q48 – What percentage of the $F_2$ progeny of a monohybrid cross is expected to have the recessive phenotype?
  • 2008 E.C., Q57 – Which of the following crosses will produce progeny with phenotypic ratio of 3:1?
  • 2008 E.C., Q83 – Suppose two heterozygous round yellow (RrYy x RrYy) pea plants wear crossed and 128 seeds were produced, how many of the seeds are expected to be heterozygous around yellow?
  • 2006 E.C., Q23 – In a cross between round green pea of RRyy genotype wrinkled yellow pea of rrYY genotype, what is the expected genotype of the F1?
  • 2005 E.C., Q11 – Which of the following is the correct $F_2$ phenotypic ratio of a monohybrid cross?
  • 2005 E.C., Q62 – In a cross between heterozygous what proportion is expected to be homozygous recessive?
4.5.3 Dihybrid Cross · read p. 136
Not asked in a national paper yet.
4.5.4 Test Crosses · read p. 138
Not asked in a national paper yet.
4.6 Sex determination · read p. 140
  • 2018 E.C., Q45 – What is the genetic composition that determines an individual to be male in humans?
  • 2009 E.C., Q9 – Which of the following is the sex chromosome constitution of human males?
  • 2008 E.C., Q11 – Which of the following is the correct constitution of the sex chromosome of a normal woman?
  • 2008 E.C., Q46 – Which of the following is true about sex determination in birds?
4.7 Non-Mendelian inheritance · read p. 142
Not asked in a national paper yet.
4.7.1 Co-dominance, Incomplete dominance and Multiple alleles · read p. 143
  • 2017 E.C., Q38 – This item is based on the following examples of genetic inheritance patterns. 1 Inflated and pinched pod forms will have inflated pod form. 2 Red cow and white bull will have a roan calf. 3 AA and BB blood type people wi
  • 2012 E.C., Q8 – Suppose a self fertilizing organism has AaBb genotype, how many different types of gametes would it produce if there is no linkage?
  • 2009 E.C., Q40 – Among the following ABO blood group genotype, which one produces two types which one produces two types of antigens?
  • 2006 E.C., Q78 – Which of the the following mating produces children all having the same ABO blood phenotypes
  • 2005 E.C., Q65 – Two parents of genotype Aa are cross-bred .The alleles show complete dominance. What proportion of the offspring will phenotypically look like their parents?
  • 2005 E.C., Q76 – Among the following mating, where the ABO blood genotype of the partners are shown, identify the mating in which all the children will have the same blood type.
4.7.2 Rh factor inheritance in humans and its medical importance · read p. 146
Not asked in a national paper yet.
4.7.3 Sex-linked inheritance in humans · read p. 147
Not asked in a national paper yet.
4.7.4 Environmental effects on phenotype · read p. 148
Not asked in a national paper yet.
4.8 Human pedigree analysis and its importance · read p. 149
  • 2017 E.C., Q41 – This item is based on the following pedigree diagram for color blindness, X-linked recessive trait. Based on the above diagram, if the family in the second generation has children, what is the probability that they will
4.9 Genetic disorders · read p. 153
4.10 Genetic testing and counseling · read p. 158
Not asked in a national paper yet.
4.11 Gene therapy · read p. 159
Not asked in a national paper yet.
4.12 Breeding · read p. 161
  • 2017 E.C., Q39 – Farmers want to maintain their sheep with long tails for the next generation through similar sheep from their locality in their breeding program. What process do these farmers apply to keep the desired traits in their pr
  • 2016 E.C., Q79 – The breeding mechanism that improves the performance of animals or plants using particular traits is
  • 2013 E.C., Q46 – The process in which individuals with a particular heritable trait survive better than the other is
  • 2009 E.C., Q41 – Which of the following methods do animal breeders use to produce domestic animals with hybrid vigor?
  • 2009 E.C., Q43 – Which of the following factors brings about changes during both evolution and breeding of plants and animals?
  • 2008 E.C., Q78 – Which of the following can be understood about living things from the study of how breeders improve domesticated plants and animals?
4.12.1 Indigenous knowledge of Ethiopian farmers · read p. 164
Not asked in a national paper yet.
4.13 Bioinformatics · read p. 165
  • 2018 E.C., Q44 – Which of the following statements best describes Mendel's Law of Independent Assortment?
  • 2018 E.C., Q46 – Which of the following is an example of non-Mendelian inheritance?
  • 2017 E.C., Q36 – Suppose there was a cross between pea plants with flower positions axial (AA) and terminal (aa) and produced F1 generation. What will be the most probable number of heterozygous dominant individuals obtained if 1000 offs
  • 2016 E.C., Q75 – What mechanism was used by Gregor Mendel to protect the garden peas from self-pollination? He
  • 2016 E.C., Q77 – Gregor Mendel crossed two pure-breeding traits of pea plants in his experiment and found only one of the traits expressed in the first generation. This shows that the
  • 2015 E.C., Q22 – In a dihybrid self-crossing of a plant with genotype DdCc, 3600 offspring were produced. How many of the offspring will have the ddcc genotype?
  • 2015 E.C., Q41 – Which one of the following events is an example of a sex influenced trait?
  • 2015 E.C., Q63 – A cross between pea plants having heterozygous genotype (Rr) has been made. Which of the following is correct about the offspring according to the Mendelian inheritance? The genotypic probability of getting
  • 2012 E.C., Q19 – Red - green colour blindness is due to X-Iinked gene and determined By the recessive alleles. Which one of the following is true about this Condition?
  • 2011 E.C., Q70 – If allowed to self-pollinate, which of the following pea genotype would produce progeny with 9 : 3 : 3 : 1 phenotypic ratio?
  • 2011 E.C., Q61 – If colour blindness is sex linked and a colour-blind man marries the daughter of a colour-blind person, which of the following is their progeny?
  • 2011 E.C., Q44 – If two parents with genotypes 'Aa' are cross-bred and that there is no codominance in the inheritance pattern, what proportion of the offspring would have genotypes exactly like that of their parents?
  • 2010 E.C., Q50 – One goat is heterozygous, long hair(Rr), and its mate carries homozygous short (rr). What is the probability of the offspring having short hair?
  • 2009 E.C., Q19 – What kind of cross is performed to determine whether the parent was homozygous or heterozygous ?
  • 2009 E.C., Q69 – Which of the plants with the following genotype is hetrozygyous?
  • 2007 E.C., Q83 – Which of the following is true ?
  • 2007 E.C., Q53 – When the F1 hybrid of a monohybrid cross is back crossed with the homozygous recessive parent, what percentage of the offspring would be homozygous recessive?
  • 2007 E.C., Q50 – A cow was found to yield much higher than any of the breeds of the parental cattle. What could be the most probable reason for this ?
  • 2006 E.C., Q60 – Which filed studies the way in which individual traits of organisms are transmitted from one generation to the next?
  • 2005 E.C., Q36 – Which of the following is NOT true abut the gene called SRY?