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Inheritance patterns and Meiosis - Coggle Diagram
Inheritance patterns and Meiosis
inheritance patterns
simple
codominance/ incomplete dominance
sex-linked
X chromosome always holds the gene, never Y chromosome
lethal genes
trisomy 21= down syndrom
trisomy
dominant = instnat death
recessive = needing a homozygous pair (carriers can have recessive genes and pass it on to children
meiosis
meiosis I
male and female = 2 cells
crossing over
gene variation
Meiosis II
4 cells
female = 1 ovum/3 polar bodies
male = 4 haploid cells
chromosomes
X and Y chromosomes determine sex
XX = female
XY = male
1 = largest
22 = smallest
chromosomes cross over in between prophase I and metaphase I
allows for variation
banding patter on chromosomes
the banding is darker where there is more adenine and thymine
body cells = autosomes
sex cells = gametes
Mendel's inheritence laws
dominance
dominant gene expressed in heterozygote
segregation
random assortement of alleles
independent assortment
inheritance of one triat is not dependant on another