Biology

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Across
  1. 1. Traits – Traits controlled by two or more genes
  2. 4. – A hormone produced by fat cells that signals the brain and ovary. As fat levels become depleted, secretion of leptin slows and eventually stops
  3. 9. to the Mean – In a polygenic system, the tendency of offspring of parents with extreme differences in phenotype to exhibit a phenotype that is the average of the two parental phenotypes
  4. 11. Variance – The phenotypic variance of a trait in a population that is attributed to differences in the environment
  5. 14. – Reversible chemical modification of chromosomal DNA and/or associated histone proteins that change the pattern of gene expression without affecting the nucleotide sequence of the DNA
  6. 15. Coefficient – Measures the degree of interdependence of two or more variables
  7. 16. Quotient (IQ) – A score derived from standardized tests that si calculated by dividing the individual's mental age by his or her chronological age and multiplying the quotient by 100
  8. 17. Traits – Traits that result from the interaction of one or more environmental factors and two or more genes
Down
  1. 2. – Agreement between traits exhibited by both twins
  2. 3. (DZ) – Twins derived from two separate and nearly simultaneous fertilizations, each involving one egg and one sperm. Such twins chare, on average, 50% of their genes
  3. 5. – An expression of how much of the observed variation in a phenotype is due to difference in genotype
  4. 6. (MZ) – Twins derived from a single fertilization involving one egg and one sperm; such twins are genetically identical
  5. 7. Cognitive Ability – Characteristic that include verbal and spatial abilities, memory, speed of perception, and reasoning
  6. 8. Variation – A distribution of phenotypic characters that is distributed from one extreme to another in an overlapping, or continuous, fashion
  7. 10. Traits – Traits controlled by multiple genes, the interaction of genes with each other, and with environmental factors where the contributions of genes and environment are undefined
  8. 12. Variation – The phenotypic variance of a trait in a population that is attributed to genotypic differences
  9. 13. Variation – Phenotypes that fall into two or more distinct, non overlapping classes