1. Mendel and Heredity Mendel and Heredity
When a magician makes a coin disappear, you know the coin has not really vanished. You simply cannot see where it is. Maybe it is up a sleeve or in a pocket. When organisms reproduce, some traits seem to disappear too. For centuries, no one could explain why. Then a careful, observant scientist showed that behind this phenomenon were inherited traits units, or genes. This scientist was Gregor Mendel.

2. Mendel and Heredity Gregor Mendel laid the groundwork for genetics.
Genetics: the study of heredity …. how traits gets passed from parent to offspring.
Traits are inherited characteristics such as eye color, leaf color, and tail length.
Mendel experimented on pea plants because they reproduce quickly and he could control how they mate.

3. Mendel and Heredity

4. Mendel crossed tall and short pea plants. He
referred to the offspring of this cross as hybrids.
Hybrids: offsprings of parents that have different forms of a trait. For example; tall and short
Mendel’s first experiments are called monohybrid crosses because only 1 trait was crossed.
P1 Generation are the original parents. Hence P, stands for parent. The offsprings of the parents are known as F1 generation. The F stands for filial. Filial means son or daughter.
When you cross two F1 plants with each other, their offsprings are called the F2 generation.

5. P1
Parents F1
You F2
Your children

6. T_________ t___________
The different forms of a gene are called alleles. One
allele is inherited from the mom and the other from the
dad.
There are dominant and recessive traits. Dominant traits
are recognized by a Capital letter and recessive traits
are a lower case.
Dominant alleles will always cover up a recessive allele.
B ________ b _________
T_________ t___________

7. BB ____________________
Genotype is the letter (gene) combination. For ex; Bb
Phenotype is the way the organism looks.
For ex; tall and skinny.
BB ____________________
Widow’s Peak ___________
Tt ____________________

8. BB________ tt_________ Bb________ Ww_______ bb_________ WW_______
Homozygous has 2 of the same alleles. Either 2 capital
letters or 2 lower case letters. Ex; TT , tt
Heterozygous has 2 alleles that are different. Contains
a capital and lower case letter.
BB________ tt_________
Bb________ Ww_______
bb_________ WW_______
Tt__________ gg________

9. Try this  BB: ________________
Identify each genotype as homozygous dominant, homozygous recessive, or heterozygous.
Identify each genotype as a hybrid or purebred.

10. A monohybrid cross between 2 heterozygous tall pea
plants. Tall is the dominant trait and short is the recessive.
Phenotypes:________________________________

11. In garden peas, round seed coats (R) is dominant to
wrinkled seed coats (r). What will the result be of a cross
between a homozygous dominant male and a recessive
female?

12. Tall is dominant to short. Cross 2 heterozygous tall
individuals.