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Bio-10.2

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Hanane ElSayed

on 29 March 2015

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Transcript of Bio-10.2

Chapter 10, lesson 2 Mendelian Genetics The study of heredity.

Heredity is the passing of traits from parents to offspring. What is genetics? Use your book to answer the following questions:

1. Who was Gregor Mendel?
2. Which plant did he work with?
3. Why did he choose this plant? (3 reasons) The father of genetics P-generation:
(True breeding green +yellow)
Cross pollination (He removed the male parts) Mendel's experiment 1. Genes are passed in two forms (one from father one from mother). He called each form an "Allele"

2. One of the alleles is "stronger than" the other. He called it dominant (represented by a capital letter), and the other recessive (represented by a small letter).

3. If an organism has two same alleles it's homozygous, if it has two different alleles it's heterozygous.

4. The genotype is the alleles in the organism, the phenotype is the physical appearance (or trait). Mendel's conclusions Used to predict possible offspring of a mono or dihybrid cross Punnett Square They are the heterozygous organisms formed in F1-generation Hybrids 1. An Austrian monk.
2. He chose the pea plant
3. It is:
true-breeding
Self pollinating
Easily pollinated by hand Answers F1-Generation: All yellow F2-Generation: 3 yellow : 1 green 1. Law of segregation: Alleles separate in meiosis and recombine during fertilization

2. Law of independent assortment: Genes on separate chromosomes don't travel together (they are assorted differently in meiosis) Laws Monohybrid cross Dihybrid cross The results of a punnett square are probabilities. The bigger the sample the more accurate the results. Remember
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