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Unit 7: How are genes inherited? - Coggle Diagram
Unit 7: How are genes inherited?
Mendel's Laws
Law of Segregation
Each parent gives only one allele to an egg or sperm so the child will have 2 total. This happens in meiosis.
Meiosis
Similar to mitosis, a sex cell doubles the amount of chromosomes and goes through two rounds of division (instead of one like mitosis) so each of the 4 (or 1 if it is a female) daughter cells have half the amount of chromosomes as the parent cell.
Law of Independent Assortment
Alleles needed for each trait are passed on to the offspring independently of one another. One trait does not also come with another trait
Law of Dominance
A heterozygous trait will hide the presence of another trait for the same characteristic as one is dominant over another.
Alleles
A variation of genes that code for the same trait but slightly different colors or things dealing with that trait.
Genotype
The genetic makeup of the organism which is represented by letters on a punnett square.
Phenotype
The appearance of the organism based on its genotype, color of hair, if they have disease or not, ect.
Types of Traits
Lethal Dominant/Recessive
If a homozygous trait is inherited it will lead to death before birth, either dominant or recessive depending on the gene.
Co-Dominance/Intermediate Dominance
Heterozygous alleles combine to form a new trait for example if the mother flower is red (RR) and the dad is white (rr) their kid will be pink (Rr) instead of normal dominant allele which just shows the dominant trait.
Types of Traits
Sex-Linked
Trait is only on the X chromosome, so males can only have one allele and whatever that allele is they will express it. Females have two XX chromosomes so traits can be dominant or recessive.
Autosomal Dominant/Recessive
Trait that is on one of the alleles on the 22 non sex chromosomes. If the trait is dominant the person only needs one allele to express the trait. If it is recessive they need both.