A disease that prevents the blood from clotting properly. It is a genetic disorder, meaning it’s the result of a change in genes that were inherited It mostly effects boys, about 1 in every 5,000 A disease that prevents the blood from clotting properly. It is a genetic disorder, meaning it’s the result of a change in genes that were inherited It mostly effects boys, about 1 in every 5,000

Internal bleeding Frequent nose bleeds Easy bruising Bleeding for no known reason Blood in urine or stool Bleeding that will not stop after cut Internal bleeding Frequent nose bleeds Easy bruising Bleeding for no known reason Blood in urine or stool Bleeding that will not stop after cut

QUESTION 1 A WOMAN WITHOUT HEMOPHILIA MARRIES A MAN WITH HAEMOPHILIA. THEY HAVE A DAUGHTER WITH HAEMOPHILIA. WHAT IS THE GENOTYPE OF THE MOTHER AND FATHER? What are the genotypes of their children? QUESTION 1 A WOMAN WITHOUT HEMOPHILIA MARRIES A MAN WITH HAEMOPHILIA. THEY HAVE A DAUGHTER WITH HAEMOPHILIA. WHAT IS THE GENOTYPE OF THE MOTHER AND FATHER? What are the genotypes of their children?

QUESTION 2 A WOMAN WHO IS HETEROZYGOUS FOR HEMOPHILIA MARRIES A MAN WHO DOES NOT HAVE HEMOPHILIA. What is the probability of having a male with hemophilia? QUESTION 2 A WOMAN WHO IS HETEROZYGOUS FOR HEMOPHILIA MARRIES A MAN WHO DOES NOT HAVE HEMOPHILIA. What is the probability of having a male with hemophilia?

QUESTION 1 A Colorblind man marries a female who is a carrier for colorblindness. What is the probability that they will have a child who is color-blind? QUESTION 1 A Colorblind man marries a female who is a carrier for colorblindness. What is the probability that they will have a child who is color-blind?

QUESTION 2 A color-blind male marries a female who is not color-blind (homozygous). What are the possible phenotypes of their children ? QUESTION 2 A color-blind male marries a female who is not color-blind (homozygous). What are the possible phenotypes of their children ?

Can a woman have colorblindness if her father does not? A woman is colour-blind but her sister isn’t, what does that tell you about their parents? A son cannot inherit colorblindness from his father. Why not?

Scientists take a picture of the chromosomes from someone's cell then they cut them out and paste them up using size The homologous pairs are arranged from descending order largest to smallest with the last pair being the sex chromosomes Scientists take a picture of the chromosomes from someone's cell then they cut them out and paste them up using size The homologous pairs are arranged from descending order largest to smallest with the last pair being the sex chromosomes

Analysis can be used to determine if individuals have abnormal numbers of chromosomes or abnormal sized chromosomes EXAMPLE: Down Syndrome Analysis can be used to determine if individuals have abnormal numbers of chromosomes or abnormal sized chromosomes EXAMPLE: Down Syndrome