Ch 2 pt 3: Mendelian Genetics

50 %
50 %
Information about Ch 2 pt 3: Mendelian Genetics
Education

Published on November 25, 2008

Author: wessellr

Source: authorstream.com

Slide 1: Thinking about the Biology of Behavior Chapter 2 Evolution, Genetics, and Experience Slide 2: Fundamental Genetics Dichotomous traits – occur in one form or the other, never in combination True-breeding lines – interbred members always produce offspring with the same trait Mendel studied dichotomous traits in true-breeding lines of pea plants Slide 3: Mendel’s Experiments Crossed a line bred true for brown seeds with one bred true for white First generation offspring all had brown seeds When the first generation were bred, the result was ¾ brown and ¼ white seeds Slide 4: Mendel’s Experiments (continued) True-breeding lines White (ww) Brown (BB) Brown was the dominant trait, appearing in all of the first generation offspring (Bw) Slide 5: Mendel’s Experiments (continued) Phenotype – observable traits Genotype – traits present in the genes If the dominant trait is present in the genotype (Bw), it will be observed in the phenotype (brown seeds) Slide 6: Mendel’s Experiments (continued) 1st generation Bw 2nd generation consists of individuals that are BB, Bw, and ww BB, Bw = brown ww = white Slide 7: Mendel’s Experiments (continued) Each inherited factor is a gene Two genes that control the same trait are called alleles Homozygous – 2 identical alleles (BB, ww) Heterozygous – 2 different alleles (Bw) Slide 8: Chromosomes: Reproduction, Linkage, and Recombination Genes are located on chromosomes in the nucleus of each cell Humans have 23 pairs of chromosomes, with an allele on each chromosome Meiosis – a process of cell division that yields cells with just 23 chromosomes Slide 9: Chromosomes: Reproduction, Linkage, and Recombination Gametes, egg cells and sperm cells, are produced by meiosis When egg and sperm combine to form a fertilized egg (zygote), 23 pairs of chromosomes are again present Mitosis – a form of cell division that yields daughter cells that have 23 pairs of chromosomes Slide 10: Meiotic and Mitotic Cell Division Figure 2.17, p. 38 Slide 11: Chromosomes: Reproduction, Linkage, and Recombination (continued) Meiosis leads to diversity as the 23 pairs of chromosomes are randomly sorted into the 2 gametes produced Linkage – the tendency of traits encoded on the same chromosome to be inherited together Crossing over – increases diversity, “shuffles the genetic deck” Slide 12: CrossingOver Crossing over shuffles the genetic material; it is why all the genes on a chromosome are not always inherited together Slide 13: Chromosomes: Structure and Replication (continued) Chromosomes are DNA molecules: double strands of nucleotide bases wrapped around each other A nucleotide on strand 1 always pairs with a particular nucleotide on strand 2 To replicate, the strands unwind; each nucleotide attracts its complementary base, making two DNA molecules identical to the original Slide 14: Sex Chromosomes and Sex-Linked Traits Sex chromosomes, X and Y, look different and carry different genes Female = XX Male = XY Sex-linked traits – influenced by genes on the sex chromosomes Dominant traits on the X chromosome will be seen more commonly in females, recessive ones in males

Add a comment

Related presentations

Related pages

Meiosis & Mendel (Ch. 6)/Extending Mendelian Genetics ...

... (Ch. 6)/Extending Mendelian Genetics Practice Test ... Mendel's second law of genetics, ... a. 1:2:1. b. 3:1.
Read more

NS 201 PT 3- 2 - Mendel & Genetics 1 2 ...

View NS 201 PT 3- 2 from NS 201 at BU. ... Mendel & Genetics 1 2 Blending Theory of Heredity ... 29 Mendelian Genetics How Are Traits Passed from ...
Read more

AP Bio- Mendelian Genetics 2: Extensions to Mendelian ...

... of a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported ... Mendelian Genetics 2: Extensions to Mendelian Genetics. Image Credits ...
Read more

Ch 13 Mendel Pt 1 - Lecs 13, 14: Mendelian Chapter 13 ...

2 3 These fossils show that life evolved over geological time ... Ch 13 Mendel Pt 2 ... Lecs 13, 14: Mendelian Genetics Chapter 13 A sweet pea ...
Read more

Chapter 11 Lesson 1 Mendelian Genetics - YouTube

Chapter 11 Lesson 1 Mendelian Genetics. Skip navigation ... Chapter 11 pt 3 and Chapter 12 pt 1 ... Chapter 11 Lesson 3 2-Factor Test Cross ...
Read more

Natural science: Week 2 Chapter 2 – Are we alone in the ...

1 2 3 4 Heritable Traits . . . You are a combination of your parents traits. ... 2/23/2015 3 Mendelian Genetics •Following genetic traits
Read more

Central High: Biology 1: Home Page - Edline

Ch 1 Learning Targets Due Ch 2 Vocab Ch 2 Learning ... Sec 2-3 Reading Guide Sec 2 ... 15 Sec 11-2 Pt 2 Reading Guide Genetics ...
Read more

BIOLA 201: Genetics (2:00-3:15 p.m., TTh)

BIOLA 201: Genetics (2:00-3:15 p.m., TTh) Spring 2000 ... Ch. 2: 1-3, 6 CD animation: chromatin structure ... 3 hour exams @100 pt = 300 pt
Read more