1. Give an example of a Homozygous Dominant, Homozygous Recessive and Heterozygous genotype.
Homozygous Dominant = TT
Heterozygous = Tt
Homozygous resessive = tt
2. What is a phenotype?
It is the physical characteristic. What does the trait look like?
TT = Tall ;Tt = Tall; tt = Short
3. Why did Mendel use Pea plants?
Easy to grow, create lots of offspring, can make pure traits, can control cross fertilization
4. What were the parent and offspring genotypes and phenotypes in Mendel’s P1 cross?
TTxtt Genotypes = All Tt Phenotype = All Tall
G. Ratio = All Alike P Ratio = All alike
5. What were the parent and offspring genotypes and phenotypes in Mendel’s F1 cross?
TtxTt Genotypes = TT, Tt, tt Phenotypes = Tall; short
G. Ratio = 1:2:1 P. Ratio = 3:1
6. What is the Law of Dominance?
In a cross of pure contrasting traits all offspring will have heterozygous genotyoe and all take the dominant trait!
7. What is the Law of Segregation?
Alleles seperate in the formation of Gametes (sex cells) (sperm and egg) and then recombine during fertilization.
8. What is the law of Independent assortment? And what kind of cross will show this?
Alleles for different traits will seperate independently from one another. tall doesn't follow wrinkled seeds and short doesnt follow round seeds and so forth. You can see this in a Dihybrid cross
9. How does Meiosis increase Genetic variability? And name where it happens.
1) Crossing over = Prophase 12)Independent assortment = Metaphase 1
3) Random fertilization = when the sperm fertilizes the egg
