quiz 2 meiosis unit thing

Genotype

Genotype

A gene that codes for a trait

Allele set (Ex. Bb)

True genetic makeup of the chromosome

Phenotype

Trait that is shown

Physical expression of genes

Outward appearance

Bb LOOKS brown (has “b” white allele)

Allele

Alternate version of genes, it accounts for variations in inherited characters, different alleles vary somewhat in the sequence of nucleotides

Trait: Eye color

Alleles: Red, white

P1 Generation

First parents

filial

Offspring

F1

First offspring (children)/1st gen

F2 (Fn)

Second set of offspring (grand)/2nd gen

Test cross

Crossing an unknown genotype (dom phenotype) with a known recessive

Punnett Square

A table to help us see the genetic probabilities of a cross

Trait

Characteristic or feature

Incomplete Dominance

Hybrid is a blend of traits

Example: Fr=RED, Fw=white to Pink Carnation

The heterozygous creates a 3rd phenotype

Every genotype has its own

phenotype

If both alleles are present and the two alleles differ

then the dominant allele is fully expressed in the organism’s appearence

The recessive allele has

no noticeable effect on the organism’s appearence

Only see recessive

if it is a double recessive

Homozygous

Pure condition

2 of the same alleles

BB=dominant

bb=recessive

Heterozygous

Hybrid condition

2 different alleles

Bb appears dominant