what is meiosis?
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What is Meiosis?. - Cell division to form sex cells where the offspring inherits genes from both parents. What are homologous chromosomes?. One chromosome lined up from each parent – there are 23 pairs of these. WHAT ARE SEX CELLS?. - PowerPoint PPT PresentationTRANSCRIPT
What is Meiosis?
-Cell division to form sex cells where the offspring inherits genes from both parents
What are homologous chromosomes?
One chromosome lined up from each parent – there are 23 pairs of these
WHAT ARE SEX CELLS?
GAMETES: They have half the normal number of chromosomes for that particular species (haploid – 23 chromosomes in
humans)
What is a Karyotype?
chromosomes of an individual are lined up as pairs from the largest to the smallest – tells about an individual’s sex and any
chromosomal disorders
What do the chromosomes of males and females look like?
XY – maleXX female
23rd pair of chromosomes
Name 3 different types of disorders caused by meiosis complications
1- Turner Syndrome – missing an X chromosome (affects girls)
2 – Klinefelter Syndrome - additional X chromosome (affects boys)
3-Down Syndrome – extra 21st chromosome (boys + girls)
What is an Allele?
Both mom and dad donate this TRAIT to their offspring
What is the difference between haploid and diploid?
Haploid = half the genetic information (sex cell)
Diploid = double the genetic information when 2 haploid cells
join to form a ZYGOTE
What is the difference between mitosis and meiosis?
2 identical vs. 4 different daughter cells, haploid vs diploid genetic info
What is the difference between homologous chromosomes and sister chromatids?
Chromosome vs. a single strand
What is it called when there is an “exchange” of genetic material between homologous chromosomes permitting diversity among a species?
Crossing over
Meiosis has 2 phases – M1 + M2 – what part of IPMAT is missing between the 2 phases?
Interphase is skipped and cells go right into prophase II
Steps for Meiosis:P (!)
M (I)A (I)T (I)
CYTOKENESISPIIMIIAIITII
CYTOKINESIS
What does the “genome” of an individual tell a researcher?
Total genetic information about an individual