1. UNIT: Genetics How do monohybrid crosses show patterns of inheritance?
For Review:
Homozygous-when 2 alleles are the same (a.k.a.purebred) represented by: BB
Heterozygous-when 2 alleles are different (hybrid) Ex. Bb
Genotype-the genetic make up of an organism Ex. Bb (indicated by letters)

2. UNIT: Genetics How do monohybrid crosses show patterns of inheritance?
For Review:
Phenotype-Physical appearance of the organism Ex. Brown eyes (indicated by the words/descriptions)
Dominant- the allele that shows up (capital letter) Ex. Brown eyes are dominant over blue because B=brown and b=blue
Recessive-allele is “hidden” by the dominant allele ex. Bb- b is the recessive allele.

3. Monohybrid crosses
Gregor Mendel wanted to cross or pollinate different pea plants with different traits.
What is the model used
to predict the chances of
inheriting 1 trait?
Punnett Square

4. How did Mendel use Punnett Squares to study why some pea plants’ flowers were purple and others were white?
Monohybrid Cross
Cross between individuals(plants) involving 1 trait ex. Pea plant color

5. Steps to a monohybrid cross
1. Determine which allele is dominant and which is recessive and Create a key for the dominant and recessive alleles
ex. T= Tabby t=stripeless fur
2. Determine the genotypes of the parent cats.
Ex. Tt x Tt
Heterozygous(Hybrid) Tabby x Heterozygous(Hybrid) Tabby

6. Steps of monohybrid crosses
3. Figure out the sex cells produced by each parent during meiosis and label the Punnett square.
Tt x Tt
T t T t
sperm sperm egg egg

7. Steps of monohybrid crosses
Bring letters down into each of the four boxes putting the capital letter first
T t T t

8. Steps of monohybrid crosses
4. While looking at the first generation of offspring, figure out what are the genotypes of the offspring? Genotype: What is the phenotype of the first generation (F1)? Phenotype:
Steps of monohybrid crosses
T t P1 TT Tt
  Tt
 tt T t F1