3.4 - Inheritance

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Across
  1. 1. fibrosis a mutation in a gene that changes a protein that regulates the movement of salt in and out of cells; characterized by the production of thick and sticky mucus.
  2. 5. blindness an abnormal condition caused by an X-linked recessive allele and characterized by the inability to clearly distinguish different colours of the visible light spectrum.
  3. 8. disease caused by a genetic defect on chromosome 4; the defect causes a part of DNA, called a CAG repeat, to occur many more times than it is supposed to.
  4. 10. allele an allele that has an effect on the phenotype only when present in the homozygous state.
  5. 12. genes chromosomes that do not determine sex.
  6. 14. a chemical or physical agent that interacts with DNA and causes a mutation.
  7. 17. the genetic constitution of an organism.
  8. 18. one of two haploid reproductive cells, egg or sperm, whose union is necessary in sexual reproduction to produce a diploid zygote.
Down
  1. 2. alleles two alleles at a particular locus that have different effects and are distinguishable in a heterozygous individual (e.g. AB blood groups).
  2. 3. a sex-linked inheritable disease characterized by loss or impairment of the normal clotting ability of blood, so that a minor wound may result in fatal bleeding.
  3. 4. inheritance traits controlled by genes located on one sex chromosome but not the other.
  4. 6. grid (or Punnett square) a tool that helps to show all possible allelic combinations of gametes in a cross of parents with known genotypes in order to predict the probability of their offspring possessing certain sets of alleles.
  5. 7. the physical and physiological traits of an organism.
  6. 9. cells have one chromosome of each pair (have one full set of the chromosomes that are found in its species).
  7. 11. a hereditary unit consisting of a sequence of DNA that occupies a specific location on a chromosome and determines a particular characteristic in an organism.
  8. 13. one of the possible alternatives of a gene, occupying a specific position on a chromosome, that controls the same trait.
  9. 15. alleles the allele that is fully expressed in the phenotype of a heterozygote.
  10. 16. the diploid product of the fusion of haploid gametes (a fertilized egg).