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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?
Meiosis is a special form of cell division.
The Cell Cycle These notes are an introduction to The Cell Cycle Unit.
Human karyotype How many pairs of chromosomes are there?
Chapter 6 Meiosis.
3.3 Review PBS.
Chromosomes, Genes and DNA
Chromosomes and their genes are made of a molecule called DNA.
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.
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.
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.
Chapter 4.3. Gametes: Reproductive cells. They contain half the usual number of chromosomes. Egg: Gamete that is formed by the female. Sperm:
Sex Cells Gametes (germ cells) Eggs and Sperm Somatic Cells All other cells Questions: 1, 2, 3, 4.
GENETICS I CHROMOSOMES GENETICS I CHROMOSOMES. A. CHROMOSOMES Chromosomes are found in the nucleus of the cell Chromosomes are found in the nucleus of.
Sex-Linked Traits Ch Sex-Linked Genes Sex chromosomes: X and Y Sex chromosomes: X and Y (male: XY, female: XX) (male: XY, female: XX) Offspring.
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.
The Cell and Inheritance Objectives: Describe chromosomes and their role in inheritance. Identify and describe the events that occur during meiosis.
Chromosome Theory & Heredity. Gene Linkage Where two or more genes occurs on the same chromosome – Located in close association with one another – Tend.
Cell Division and Fertilization
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