click below
click below
Normal Size Small Size show me how
Genetics Review
BIO 301 Genetics Fundamentals Looking a MEIOSIS (Hickman-'Zoology' based)
Question | Answer |
---|---|
Offspring inherits from its parents a set of coded information known as... | Genes |
Ova and sperm... | Sex Cells or Gametes |
Pair of chromosomes in cells also known as... | Homologous Chromosomes |
The number of chromosomes in a single set which varies among different species is known as... | Haploid |
After fertilization..each gamete contributes its set of chromosomes to a newly formed cell also known as... | Zygote |
The number of chromosomes in two complete sets is called the... | Diploid Number |
In most simple terms meiosis: | separates the chromosomes of each homologous pair |
Meiosis ultimately produces... | four genetically unique cells, each with half the number of chromosomes as in the parent |
Meiosis is derived from Greek word.... | meaning 'lessening' |
According to recent research scientists divide meiosis into 3 stages: | G1 (growth one) phase; Synthesis phase (S phase); Growth 2 (G Phase) |
In what phase the most unique features of meiosis takes place? | Consider the first meiotic division! 1. During prophase one lie with side by side contact or synapsis forming bivalents 2. During metaphase one - bivalents align at spindle equator 3. chromosomes of former bivalents move to different poles |
Genetic recombination between two chromosomes.. | during prophase members of each homologous pair undergo synapsis to bivalent which permits genetic recommendation between paired homologous chromosomes! |
Ultimately, what are the final products of meiosis? | By the end of second meiotic division, the cells have a haploid number of chromosomes, and each chromatid of the original tetrad exists in the separate nucleus. Evidently, in female gametogenesis, only 1 out of 4 products become a functional gamete. |
Species used in the first discovery of meiosis by German Biologist Oscar Hertwig | Sea Urchins.... |
Compare function of meiosis and mitosis | MITOSIS: Cellular reproduction MEIOSIS: Sexual reproduction (sex cell reproduction) |
Compare crossing over in meiosis and mitosis | MITOSIS: rarely MEIOSIS: Yes, typically between each pair of homologous chromosomes |
Compare meiosis and mitosis - genetic similarity of produced cells | MEIOSIS: NO MITOSIS: YES |
Compare mitosis and meiosis end result: | Meiosis: 4 cells- each with half the number of chromosomes as the parent Mitosis: 2 cells - having the same number of chromosomes as the parent |