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2 of 3© Boardworks Ltd 2009 What are sex chromosomes? Humans cells contain one pair of sex chromosomes, which control gender. Males have one X and one Y chromosome (XY). Y chromosomes are very small and contain 78 genes, whereas X chromosomes are larger and contain 900–1,200 genes. Because females can only produce X gametes, it is the sperm that determine the sex of the offspring at fertilization. X chromosome Y chromosome Females have two X chromosomes (XX).
3 of 3© Boardworks Ltd 2009 Boy or girl?
© Boardworks Ltd of of 11© Boardworks Ltd 2010 Homozygous cross.
6.1 Chromosomes and Meiosis KEY CONCEPT Gametes have half the number of chromosomes that body cells have.
Sex Cells Gametes (germ cells) Eggs and Sperm Somatic Cells All other cells Questions: 1, 2, 3, 4.
1 of 29© Boardworks Ltd 2011 Inheritance. 2 of 29© Boardworks Ltd 2011.
Sex Chromosomes. Determines the sex of the individual Female has two identical X chromosomes (XX) Male has dissimilar chromosomes ◦ One X and one Y (XY)
1 of 8© Boardworks Ltd of 8© Boardworks Ltd 2014 Where is the inherited information? An organism’s features can be inherited or caused by environmental.
Human Reproduction and Alleles Genetics Week 2. I Can… I Can#12: explain that sexual reproduction produces offspring that inherit half their DNA from.
SECTION 6.1 CHROMOSOMES AND MEIOSIS. YOU HAVE BODY CELLS AND GAMETES Somatic Cells Definition: body cells; make up most of your body tissues and organs;
NOTES 21 - Sex-Linked Inheritance In humans, sex is determined by the 23 rd chromosome pair.
© Boardworks Ltd of 20 © Boardworks Ltd of 28 From a cell to DNA.
3.3 Review PBS. How is DNA passed to new cells during cell division? Mitosis – Makes two duplicate body cells – Used for growth and repair of cuts – Before.
Meiosis Review. What are gametes? – Sex Cells Male Sex Cells? – Sperm Female Sex Cells? – Eggs Gametes are made during what cell process? – Meiosis Sperm.
MEIOSIS. Vocabulary 1. Meiosis – formation of gametes 2. Gametes – reproductive cells female – egg male – sperm (animals) - pollen (plants) 3. Diploid.
You and Your Genes Revision Lesson 1. What are Genes? All living organisms are made of cells All living organisms are made of cells Most cells have a.
The Cell and Inheritance What is the difference between sexual and asexual reproduction? What are the differences between mitosis and meiosis? How many.
Human karyotype 1.How many pairs of chromosomes are there? 2.How many chromosomes does a human cheek cell contain? 3.How many chromosomes does a human.
Sex Cells and Inheritance Cells- more on the nucleus Animal and plant cells contain a nucleus. The nucleus controls cell activities including cell division.
Chromosome Theory & Heredity. Gene Linkage Where two or more genes occurs on the same chromosome – Located in close association with one another – Tend.
Chapter 10 Asexual and Sexual Reproduction. You Must Know The difference between asexual and sexual reproduction. The role of meiosis and fertilization.
Chapter 4, Section 1. Traits are controlled by: A single gene with 2 alleles. OR A single gene with multiple alleles. OR Many genes that act together.
DO NOW – 2/15/08 Complete the two Dihybrid crosses on eye color and widow’s peak. Report the phenotypic ratios in your DO NOW.
What is a homologous chromosome? Objectives What is a karyotype? What are homologous chromosomes? Differentiate between autosomes and sex chromosomes.
Karyotype Notes. A karyotype is a “ picture ” of a person ’ s chromosomes. Each person has 46 chromosomes, in 23 pairs. Pairs 1-22 are called Autosomes.
What is DNA? Chromosomes and their genes are made of a molecule called DNA. DNA molecules carry the code that controls what your cells are made of and.
Finishing your poster... Can you be creative? Human chromosomes.
Activity- Happy Families Mum and Dad are both heterozygous for the tongue rolling gene. They can both Roll their tongues. A tub with 10 blue (roller) and.
Reproduction Reproduction: making a copy of something Two Types: Asexual and Sexual.
GENETIC VARIATION. Genetic Variation Meiosis and sexual reproduction ensure that variation occurs in individuals within a population/species.
Chapter 11-4 Meiosis. Let’s make a sex cell! Meiosis – Production of haploid gametes Meiosis – Production of haploid gametes Diploid- has paired chromosomes.
“body cells” DNA in body cells is not passed to offspring Body cells contain pairs of chromosomes Human body cells have 23 pairs, or 46 individual.
6.1 Chromosomes and Meiosis UNIT 3: GENETICS: The study of genes, heredity, and variation.
UNIT 10 LESSON 1 – TRAITS 2 INTRODUCTION TO GENETICS.
1 of 6© Boardworks Ltd of 6© Boardworks Ltd 2013 From cell to organism All living things are made up of cells. The appearance of each living thing.
Human body cells have 46 paired chromosomes or 23 pairs of chromosomes. Human gametes have 23 unpaired chromosomes When a sperm and egg unite each.
Human Inheritance Human Inheritance Mrs. Wharton’ Science Class.
Meiosis and Reproduction Biology 1-2. Chromosomes Chromosomal theory of inheritance- genes have specific locations on chromosomes. Chromosomal theory.
Genetics: Karyotypes and Sex-linked traits March , 2010.
MEIOSIS: The Production of Sex Cells *Click for Animation*
Chapter 27 Human Genetics. Chapter 27.1 Notes 3 things about chromosomes 1.Humans have 46 chromosomes in all body cells. 2.Humans have 23 chromosomes.
Chromosomal Basis of Inheritance Tracing Heredity through Inheritance of Specific Chromosomes.
Sex-linked Traits Ch Sex chromosomes Humans- 23 rd pair of chromosomes- X,Y Eggs- Have an X chromosome. Sperm- Half have an X chromosome, half.
Section 1: Human Inheritance 7.2 A typical cell of any organism contains genetic instructions that specify its traits. Those traits may be modified by.
Meiosis Cell division – ‘ reduction division’ Production of sex cells – gametes.
Sex Determination Sex determined by genes found on the X and Y chromosome Females: egg produced with an X chromosome Males: ½ sperm cells contain X;
Sex Influenced Baldness in humans is a dominant, sex-influenced trait. This gene is on the autosomes, not the sex chromosomes. A man who is BB or Bb will.
SEXUAL REPRODUCTION Quiz 6B. sexual reproduction the joining of haploid gametes to form a diploid zygote, which develops into a new individual each offspring.
Notes E 4.3 Meiosis is a special form of cell division.
2B: creating sperm and egg 2D: fertilization creates new genetic combinations 2E: each parent contributes half of their DNA 2F: sex chromosomes determine.
Chapter 6 Meiosis. Your Cells Somatic Cells – aka body cells – Most of the cells in your body – Undergo mitosis Gametes – aka sex cells – Eggs and sperm.
14. Pedigrees/ Human Genetics. Fruit Fly- Drosophila melanogaster, used by scientists to study genes and heredity. Advantages of Fruit Flies Short.
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