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Lecture 36

BIOL 1000 Lecture 36: Lecture 36

3 Pages

Biological Sciences
Course Code
BIOL 1000
Kevin G.Scott

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o982 2) For each character, an organism inherits 2 alleles, one from each parents  o Homozygous = two identical alleles for a gene o Heterozygous = two different alleles for a gene  3) If two alleles of an inherited pair differ, then one determines the organism’s appearance and is  called = dominant (uppercase) o Recessive = allele with no noticeable effect on the organism’s appearance (lowercase) 4) A sperm or egg carries only one allele for each inherited character because allele pairs separate  form each other during the production of gametes = law of segregation o Pairs of alleles segregate during gamete formation o Fusion of gametes at fertilization creates allele pairs again  Punnett square = diagram of the 4 possible combinations of alleles that could occur when 2 specific  gametes combine Phenotype = an organism’s physical traits  Genotype = an organism’s genetic makeup Homologous Chromosomes Bear the Alleles for Each Character Locus = a specific location of a gene along the chromosome  Homologous chromosomes have genes for the same characters located at the same positions along  their lengths 2 homologous chromosomes may have the same allele or different ones Alleles of a gene reside at the same locus on homologous chromosomes The Law of Independent Assortment is Revealed by Tracking Two Characters at Once Mendel crossed homozygous plan
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