Please enable JavaScript.
Coggle requires JavaScript to display documents.
Understanding Inheritance (modeling inheritance (punnett Squares (a model…
Understanding Inheritance
what controls traits?
2 factors control each trait
Chromosomes
every cell has a nucleus, which has DNA
chromosomes combine, one from each parent
genes and alleles
1 chromosome=~1000 traits
different forms of a gene = alleles
Genotype and phenotype
phenotype is how the gene appears in an animal
the two alleles that control the phenotype are the phenotype
there are symbols for the phenotype: capital letters are dominant Alleles, and lowercase letters are recessive alleles
2 same alleles = homozygous. 2 different alleles = heterozygous
modeling inheritance
punnett Squares
a model used to try and predict inheritance
analyzing punnett squares
using ratios to predict
if a plant has a 3:1 ratio, 25% will have the recessive phenotype
pedigrees
shows genetic relationship between parents and children
plant and animals try to predict how and animal will be using punnett squares.
Complex patterns of inheritance
types of dominance:
incomplete dominance: is when the child’s phenotype is a combo. of the parents’ phenotypes
Codominance: when both alleles are shown in the phenotype
multiple alleles
some genes have more than 2 alleles
but each person can only have 2 alleles
polygenic inheritance
is when multiple alleles affect one trait
Mendel only studied traits with 1 gene and 2 alleles
Genes and the environment
out health affects how we look
our environment affects how we look