Studied by 2 peopleGenes
Segments of DNA that code for basic units of heredity
What alternates in sexual life cycles?
Fertilization and MEIOSIS
Fertilization
A sperm cell (haploid) fuses w an egg (haploid) to form a zygote (diploid)
A dihybrid cross results in what ratio of phenotypes
9:3:3:1
Is AaBb x AABB a dihybrid cross?
No, dihybrid crosses are hetero x hetero
What does a monohybrid cross result in?
Phenotype: 3:1
Genetic: 1:2:1
Allele
Alleles are alt versions of genes
2n = 40, how many pairs of homologous somatic cells?
20
Stage of meiosis where an abnormality would happen!
Anaphase 2
Meiosis is exposed to a toxin, hat stages would be most affected?
Anaphase 1 & 2
AABbCCDd x how mnay unique gamates?
4
Law of independent assortment
The alleles of 2 or more diff genes get sorted into gamates independently from one another
Whihc chromosomes do NOT determine the sex of the organism?
Autonomies
Fertilization
Two gametes fusing together
When 2 gametes fuse during fertilization, what do they form?
A zygote
Crossing over (occurs in the chiasmata)
When the homologous chromosomes pair up and trade sections of dna
Synapsis
In Prophase 1; homologous chromosomes pair up and physically connect to each other (this forms a tetrad)
When 2 sets of homologous chromosomes pair up to cross over prophase 1, what do they form?
A tetrad
True breeding
The process of passing the same PHENOTYPIC traits to offspring after generations of SELF BREEDING
Note
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