Mendelian Punnett Squares
Complete a punnet square for TT and tt and list your genotype results
100% Tt
Complete a punnett square for a parent that is incompletely dominantly white (WW) over a parent with red petals (rr). List the genotypes and phenotypes
100% Wr: Spotted white and red
___________ is the passing down of traits from one generation to the next.
Heredity
Jimmy has a big nose. His genotype is GG. Sally also has a big nose. Her genotype is Gg. What are the possibilities for their children's genotypes?
50% GG and 50% Gg
A characteristic of a species determined by specific genes.
Trait
Complete a Punnett square for Gg and Gg and list your genotype results
25% GG 50% Gg 25% gg
Complete a punnett square for a parent that is dominant for white petals (Wc) and a parent that is dominant for red petals (Rc). The allele c is reccessive for blue petals. List the genotypes and phenotypes
25% RW: spotted
25% Rc: Red
25% Wc: White
25% cc: Blue
A pair of alleles that are the same are called __________________.
Homozygous
Jared is homozygous for short eyelashes. His wife is homozygous for Long eyelashes. Long eyelashes (L) are dominant to short eyelashes (l). What are the possible genotypes for their children?
100% Ll
A gene that always shows itself. The presence of this type of gene will mask the other gene in the allele
Dominant
Complete a Punnett square someone who is heterozygous for tall and for someone who is homozygous for short.
50% Tt 50% tt
Cross a parent with O blood (ii) and a parent with AB blood (IAIB). What are the genotype and phenotypes?
50% IAi: Type A and 50% IBi: Type B
___________________ describes a pair of alleles and is represented by letters such as Tt or TT.
Genotype
In humans, there are four types of blood a person can receive: A, B, AB, or O. Type O is considered recessive. What is the percentage of a child ending up with type B blood, if one parent has AB blood and the other has Type O?
GG, Gg, Gg, gg. Green eyes are dominant to blue eyes. What percent have green eyes? What percent have blue eyes?
75% green eyes and 25% blue eyes
Complete a Punnett square for someone who is Homozygous for green eyes and someone who has blue eyes. Green is dominant over blue.
100% Gg
BG, Bg, BG, Bg
bg, bg, bg, bg
What is the difference between incomplete dominance and co-dominance?
In incomplete dominance the alleles will mix, but co-dominance will show both alleles in the phenotype
Cows express co-dominance in their coat color. If a white cow, WW, and a brown, BB, cross with each other, what are all of the possible phenotypes for their offspring? (BB = brown, BW = speckled, WW = white)
Who is the father of genetics that worked with pea plants?
Gregor Mendel
The four answers for a Punnett square are Zz, Zz, zz, zz. What are the genotypes for the parents?
Zz and zz
If several pea plants with the polygenic genotype TTYy are crossed with pea plants with the genotype Ttyy, what percentage of the offspring will be expected to have the TTYy allele combination?
25%
What are Mendel's three principles?
Principle of independent assortment, principle of dominance and recessiveness, and principle of segregation.
In plants known as “four o’clocks”, the allele for the dominant red-flower color, RR, is incompletely dominant over the allele for white-flowers, ww. A gardener allows several heterozygous pink-flowered four o’clocks to self pollinate and collects 200. Identify the flower color phenotypes and theoretical percentage.
25% RR: Red, 25% ww: White, 50% Rw: Pink
What are two examples of polygenic traits?
Eye color, skin color, height, or hair color