Chapter 12 Biology
Incomplete Dominance
Heterozygus individual mixture that looks like the two homozygus.
Codominance
Both phenotypes are present.
What are external and internal factors that can affect gene function? (2 each)
External-Leaves size and Arctic fox coat color depends on temperature. Internal-Male pattern baldness and horn size in a mountain sheep is effected by different hormones.
Autosomes
First 22 chromosomes.
Polygenic Inheritance
Traits that are controlled by ore than two genes.
Sex-Linked Traits
Traits that are on the X and Y chromosomes.
Human Genome
Trying to map out all 23 chromosomes and what is on them.
heterozygus, carrier, homozygus
homozygus; the carrier is heterozygus
Pedigree
A visual representation of how genes are inherited. (Family Tree)
Cystic Fibrosis, Tay-Sachs Disease, Phenylketonuria
All examples of simple recessive heredity
autosomes, X and Y chromosomes, sex-linked traits, sex chromosomes
Autosomes; do not fit with the making of the offspring
Sex Chromosomes
23rd Chromosome Female=XX Male=XY
Huntington's disease
Dominant Heredity
How does incomplete dominance differ from multiple alleles?
Incomplete dominance is a heterozygus individual mixture that looks like two homozygus. Multiple alleles are more than two alleles.
Multiple Alleles
More than two alleles.
How does polygenic inheritance differ from Mendelian inheritance?
Polygenic inheritance is the inheritance pattern of a trait that is controlled by two or more alleles. Mendelian inheritance are dominant traits.
Transgenic Organisms
Recombinant DNA
What things can influence gene expression?
Temperature, nutrition, light, chemicals, and infectious agents.
phenotype, genotype, heterozygus, homozygus
phenotype; describes the way an organism looks