F13 lecture 2 v2

Two divisions 2n 1n gives rise to 4 haploid 1n gametes

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Unformatted text preview: alleles for pea plant height) -differ in some way in the DNA sequence of the gene gene7c conven7ons •  Capital and lower case leRers to indicate two different alleles –  A, a •  Genotypes: –  Aa or A/a •  If mul7ple alleles –  superscripts or subscripts •  A1A2 •  C1C3 gene7c conven7ons: mul7ple loci •  genotype: A1 B2 C4 ___________ A4 B4 C1 separate different chromosomes by semicolon A1 B2 C4 C4 E1 F1 ___________ ; __________ A4 B4 C1 C1 E1 F1 gametes are generated by meiosis •  remember: –  mitosis is cell replica7on/prolifera7on during growth •  one diploid (2N) cell replicates its genome and gives rise to two iden7cal diploid (2N) cells •  meiosis –  diploid premeio7c cell (2N) replicates to become 4N and then undergoes two divisions - >2N - >1N •  gives rise to 4 haploid (1N) gametes –  typically four sperm in males, 1 egg + 3 polar bodies in females one locus illustrated on one chromosome (in this case, A/a heterozygote; “monohybrid A a replication pre-meiotic cell (2N) A a 1st division 4N A a a 2nd A division 25% a 2nd division 25% 50% 25% A 25% A a 50% Punne= Square method for a cross (we will...
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This document was uploaded on 02/27/2014.

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