Genetics History
Give one characteristics Mendel used to study heredity using pea plants?
Seed shape, flower color, tallness
Using the letter "T" represent a heterozygous individual
Tt
How many traits do each parent have for a monohybrid cross?
Only one
How many traits does each parent have in a dihybrid cross?
2 each
T = tall t = short
Tt : What will the organism's phenotype be?
Tall
Who was the Father of Genetics?
Gregor Mendel
Using the letter "t" show a homozygous recessive individual.
tt
The simplest way to predict the results of a monohybrid cross is by using a __________ square
Punnett
Set up a punnett square with parents with genotypes: GGbb X ggBB
Top: Gb Gb Gb Gb
Side: gB gB gB gB
R = round seeds
r = wrinkled seeds
What genotype would show wrinkled seeds as the phenotype?
rr
Mendel's Theory of Heredity states that Capital letters represent _______ alleles, lowercase letters refer to _________ alleles
dominant, recessive
the branch of biology that studies heredity
Genetics
Cross a homozygous dominant for coat color with a homozygous recessive
B = black coat
b = brown coat
What percentage will be heterozygous?
100%
G = gray hair
g = white hair
B = black eyes
b = red eyes
What will the rabbit look like if it's genotype was Ggbb
gray hair, red eyes
Law of __________ states that genes are separated randomly into the parent gametes
Segregation
The physical appearance of a trait in an individual is its ____________
phenotype
Write the genotype for homozygous recessive for coat color and heterozygous for ear length.
B- black coat b - brown coat
L- long ears l - short ears
bbLl
Purple flowers are dominant to white flowers.
PP x pp
Show genotype and phenotype %
100% Pp
100% purple flowers
In rabbits, the allele for a black coat (B) is dominant over the allele for a brown coat (b). Also, the rabbits will have either long ears (L) or short ears (l).
Cross a homozygous dominant for black fur & long ears with a rabbit who has brown fur and is heterozygous for long ears.
What is the genotype fractions?
BbLL : 8/16
BbLl : 8/16
List all the genotypes where the dominant allele must show.
AA Dd EE ff Jj RR Ss pp
AA, Dd, EE, Jj, RR, Ss
Ttgg represents an organism's _________
genotype
What is the difference between a gene and an allele?
Gene - segment of DNA
Allele - a variation of a gene
A heterozygous black fur rabbit is crossed with a white fur rabbit. Predict the
genotypic and phenotypic outcomes.
50% Bb, 50% bb
50% black fur, 50% white fur
Cross GGbb with ggBb. How many out of 16 are white fur, black eyes
0/16
What do the letters on the outside of the punnett square represent?
The parent's genotypes