biochap13

biochap13 - CHAPTER 13 GENES genes- units of hereditary,...

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CHAPTER 13 GENES genes - units of hereditary, segments of DNA ASEXUAL REPRODUCTION homologous chromosomes - the two chromosomes composing a part -same length, same centromere position, staining pattern -Both chromosomes of each pair carry genes controlling the same inherited character sex chromosomes - X and Y chromosomes -other chromosomes are autosomes diploid cell - has 2n- diploid number of chromosomes gametes are haploid - has single chromosome set THE VARIETY OF SEXUAL LIFE CYCLES alternation of generations - include both diploid and haploid muticellular stages - sporophyte - diploid stage -produces haploid spores - gametophyte - multicellular haploid stage -sporophyte generation produces a gametophyte as its offspring, gametophyte generation produces the next sporophyte generation Third type of life cycle -gametes fuse and form a diploid zygote- meiosis occurs w/o diploid offspring developing -haploid cells divide by mitosis and give rise to haploid multicellular adult organism Prophase I -Crossing over occurs
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biochap13 - CHAPTER 13 GENES genes- units of hereditary,...

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