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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?
I.Sexual Reproduction --two parents combine. 1. The sex cell from the male parent is sperm. a. Sperm head is almost all nucleus (genetic info) 2. The.
© Boardworks Ltd of 48. © Boardworks Ltd of 48.
Meiosis Review. What are gametes? – Sex Cells Male Sex Cells? – Sperm Female Sex Cells? – Eggs Gametes are made during what cell process? – Meiosis Sperm.
Notes E 4.3 Meiosis is a special form of cell division.
Sex Chromosomes and Linked Genes A normal human cell (autosome) contains 46 chromosomes. 22 pairs of regular chromosomes and one pair of sex chromosomes.
Lecture 38 Prof Duncan Shaw. Chromosomes and karyotypes Chromosomes are easily prepared from blood (and other) cells, and examined by microscope - a karyotype.
Genetics Since Mendel Chapter 5, Section 2. Genetics Since Mendel What have we found out since Mendel? What have we found out since Mendel? Since Mendels.
SEXUAL REPRODUCTION Sex cells formed by meiosis Requires 2 parents Offspring not identical The process that results in the formation of gametes Sex cells,
Simple genetics example Albino rabbits have white coats and red eyes. This is due to lack of the pigment melanin Albinos are actually rather rare in the.
Write everything that is underlined Section 6-1 Chromosomes & Meiosis Section 6-1 Chromosomes & Meiosis.
Fertilisation. The male reproductive system The female reproductive system.
Meiosis and Reproduction. Types of Reproduction Asexual Reproduction – production of offspring that requires only one parent; all the genetic materials.
Genetics: Vocabulary Nucleus DNA Chromosome Allele Gene Traits Dominant Recessive Genotype Phenotype Homozygous Heterozygous.
More Punnett squares. Complete Dominance Involves dominant and recessive alleles dominant allele always overpowers the recessive allele in appearance.
Mendels Laws of Heredity Why we look the way we look...
Chapter 13 Meiosis And Sexual Life Cycle. An Introduction to Heredity Heredity: the transition of traits from one generation to the next Along w/ similarities,
Study Guide BIOLOGY GENETIC I. Central Idea 1: Living systems reflect a hierarchy of levels of organization. This is described in the following flow chart:
A special type of cell division. Only occurs in reproductive organs Reduces the number of chromosomes in the nucleus -Reduction division.
Reproduction and Genetics Chromosomes and Genetics Agriscience Curriculum.
Chapter 14 Part II Chromosomes and Genes Incomplete dominance, codominance, multiple alleles, epistasis, polygenic inheritance, the chromosomal theory.
Sex-linked Inheritance. Sex Determination Why are some diseases more common in men than women? Ex. Color blind 8 % of males, 8 % of males,
Meiosis is a process of cell division that creates sex cells (gametes). The sex cells are the ones that combine to form a new organism. Meiosis is a type.
Mendels Laws. What we already know… Inheritable factors or genes are responsible for all heritable characteristics Phenotype is based on Genotype Each.
Every living thing has a set of characteristics inherited from its parent or parents Heredity holds the key to why each species is unique Genetics:
R EVIEW G AME C H 22 Objective: Review DNA, cell division and evolution.
Each of us inherit many personal characteristics from our parents. EX: physical build, skin color, hair color & texture, eye color & shape. Just as personal.
4.1 Living Things Inherit Traits in Patterns We know the offspring produced by sexual reproduction have genetic material from two parents Offspring get.
GENETICS & HEREDITY. w GENETICS - The study of the way animals & plants pass on to their offspring such as: w eye color, hair color, height, body build,
1 Reproduction and Meiosis. 2 Reproduction Reproductionthe process of producing offspring –Asexualone parent, offspring are genetically identical to parent.
Sex Cells and Fertilisation Sexual Reproduction. Copy the following definition: Reproduction is the method by which the members of a species produce offspring.
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