| 7932236332 | heredity | passing of traits from parents to offspring | | 0 |
| 7932236333 | genetics | the scientific study of heredity | | 1 |
| 7932254465 | genes | segment of DNA that code for basic units of heredity | | 2 |
| 7932439724 | locus | a specific place along the length of a chromosome where a given gene is located | | 3 |
| 8358816486 | polygenic trait | trait controlled by two or more genes; shows a wide variety of phenotypes | | 4 |
| 8358823994 | pleiotropic trait | The single gene controlling or influencing multiple (and possibly unrelated) phenotypic traits. | | 5 |
| 7932236334 | meiosis | -cell division that produces reproductive cells in sexually reproducing organisms
-REDUCES the number of sets of chromosomes from two to one in the gametes
-cells divide TWICE, resulting in 4 daughter cells with 1/2 as many chromosomes as the parent cell | | 6 |
| 7932236335 | asexual reproduction | -produces clones (genetically identical individuals) through the fusion of gametes
-single parent
-little variation, only through mutations
-fast and energy efficient
-examples: budding, binary fusion | | 7 |
| 7932236336 | sexual reproduction | -meiosis produces gametes (sex cells)
-2 parents (male and female)
-lots of variation/diversity
-slower and more energy consumptive
-example: humans and trees | | 8 |
| 7957944988 | sex chromosomes | chromosomes that determine the sex of an individual (X and Y chromosomes) | | 9 |
| 7957944989 | autosomes | non-sex chromosomes | | 10 |
| 7932339715 | XX | female sex chromosomes | | 11 |
| 7932339716 | XY | male sex chromosomes | | 12 |
| 7932439725 | gametes | -transmit genes from generation to the next
-22 autosomes + 1 sex chromosome
-egg: 22 + X
-sperm 22 + X *OR* 22 + Y | | 13 |
| 7932439726 | karyotype | a display of the chromosome pairs of a cell arranged by size and shape (arranged largest to smallest in pairs) |  | 14 |
| 7932439727 | fertilization | the joining of a sperm cell and an egg cell | | 15 |
| 7932439728 | zygote | a fertilized egg | | 16 |
| 7932439729 | meiosis can start | once an egg becomes a zygote, then what can start? | | 17 |
| 7932439730 | fertilization and meiosis | _______ and ________ alternate in sexual life cycles. | | 18 |
| 7957944990 | life cycle | the generation-to-generation sequence of stages in the reproductive history of an organism | | 19 |
| 7957944991 | homologous chromosomes (homologs) | pair of chromosomes that are the same size, same appearance and same genes. | | 20 |
| 7957944992 | gamete cells | the only cells NOT produced by mitosis | | 21 |
| 7957944994 | meiosis I and meiosis II | what are the two consecutive cell divisions in the process of meiosis? | | 22 |
| 7957944995 | 4 (each with half as many chromosomes as the parent cell) | meiosis I and meiosis II result in how many daughter cells? | | 23 |
| 7958514489 | separates homologous chromosomes | what does meiosis I do? | | 24 |
| 7958514490 | Prophase I, Metaphase I, Anaphase I, Telophase I + cytokinesis | what are the 4 stages in meiosis I ? | | 25 |
| 7958514491 | prophase I of meiosis | -chromosomes condense
-crossing over occurs: DNA of non-sister chromatids are broken by proteins and rejoined to each other
-in this stage, each homologous pair has 1+ x-shaped regions called CHIASMATA where crossovers have occurred
-microtubules from both poles will attach to two kinetochores and then the pairs will move toward the metaphase plate | | 26 |
| 7958514492 | metaphase I of meiosis | -homologous chromosomes line up along equator
-both chromatids from one homolog are attached to microtubules from both poles | | 27 |
| 7958514493 | anaphase I of meiosis | -homologous chromosomes are pulled apart into individual chromosomes
-the homologs move toward opposite poles | | 28 |
| 7958514494 | telophase I and cytokinesis | -when telophase I begins, each half of the cell has a complete haploid set of duplicated chromosomes composed of 2 sister chromatids
-the cytoplasm divides and chromosomes gather at the poles of the cells
-in animal cells a cleavage furrow forms and in plant cells a cell plate forms | | 29 |
| 7958514495 | separates sister chromatids | what does meiosis II do? | | 30 |
| 7958514496 | Prophase II, Metaphase II, Anaphase II, Telophase II + cytokinesis | what are the 4 stages in meiosis II ? | | 31 |
| 8257454495 | Prophase II of meiosis II | -a spindle apparatus forms
-chromosomes move toward the metaphase II plate | | 32 |
| 7958514498 | metaphase II of meiosis II | -chromosomes align down the center of the cell
-because of crossing over in meiosis I, the two sister chromatids if each chromosome are NOT genetically identical
-the kinetochores of sister chromatids are attached to microtubules extending from opposite poles | | 33 |
| 7958514499 | anaphase II of meiosis | -chromatids separate toward opposite poles as individual chromosomes | | 34 |
| 7958514500 | telophase II and cytokinesis of meiosis | -nuclei form
-chromosomes uncoil and nuclear membrane reappears
-the meiotic division of one parent cell produces four daughter cells, each with a haploid set of unduplicated chromosomes
-the 4 daughter cells are generally distinct from one another and the parents | | 35 |
| 7958514501 | cohesins | proteins that hold sister chromatids together | | 36 |
| 7958514502 | synaptonemal complex | zipper-like proteins that hold together homologous chromosomes (the binding is called SYNAPSIS) | | 37 |
| 7958514503 | crossing over, independent assortment, random fertilization | what are the 3 sources of genetic variation? | | 38 |
| 7958514504 | crossing over | exchange of genetic material between homologous chromosomes during prophase I of meiosis |  | 39 |
| 7958692949 | recombinant chromosomes | a chromosome created when crossing over combines the DNA from two parents into a single chromosome | | 40 |
| 7958514505 | independent assortment | random distribution of homologous chromosomes during meiosis | | 41 |
| 7958514506 | random fertilization | any sperm can fuse with any egg (64 trillion combinations!!) | | 42 |
| 7958514507 | MITOSIS:
-somatic cells
-1 division, 2 diploid daughter cells
-clones
-no synapsis/crossing over
-purpose: growth/repair
—
MEIOSIS:
- gametes (sex cells)
-2 divisions, 4 haploid daughter cells
-combination of traits
-synapsis/ crossing over can occur
-purpose: reproduction | mitosis vs. meiosis | | 43 |
| 7958692950 | synapsis and crossing over, homologous pairs at the metaphase plate, and the separation of homologs | what are 3 events that are unique to meiosis? | | 44 |
| 7958692951 | alleles | different forms of a gene, the bands you see on DNA | | 45 |
| 7958692952 | sexual dimorphism | differences in physical characteristics between males and females of the same species | | 46 |
| 7958692953 | nondisjunction | error in meiosis in which the homologous chromosomes fail to separate properly |  | 47 |
| 7958692954 | gonadal dysgenesis | a male has female genitalia and doesn't produce enough testosterone (WHAT SANTHI SOUNDARARAJAN HAS) | | 48 |