1. YoungHak Kim Who is responsible for determining gender? (5E model)

2.  In Korea, people had a preference for sons.  About 500 years ago, in Chosun dynasty, if a wife didn't give birth to a son, she often was divorced. Is that situation reasonable and rational? Didn’t a husband have any responsibility for determining a son? "In a biological perspective, who is responsible for determining a son, husband or wife?" (Draw a diagram by using the symbol of sex chromosomes.)

3.  Based on meiosis and fertilization, explore sex determination.

4.  Females have two of the same kind of sex chromosome (XX),  while males have two distinct sex chromosomes (XY).  Female eggs have one kind of sex chromosome: X  Male sperms have two kinds of sex chromosome: X, Y  When sperm(X) meets egg(X), XX means female gender.  When sperm(Y) meets egg(X), XY means male gender.  Thus gender is determined by male sperm, because females only have X and gender is determined by which male chromosome(XY) is combined with that.

5. 3. This is a healthy human chromosome set. 1) How many chromosomes does it have? 2) Is this chromosome set for Male or female?

6. 4. This is another human chromosome set. 1) What is the difference between the healthy chromosome set and this set?

7. 2) We call it 'Turner syndrome ". Explain the reason why she doesn't have two ( ) chromosomes. ? ? ? ?? ??

8.  Most girls are born with two X chromosomes, but girls with Turner syndrome are born with only one X chromosome or they are missing part of one X chromosome.  Girls with Turner syndrome are usually short in height. Turner syndrome prevents the ovaries from developing properly, which affects a girl's sexual development and the ability to have children.

9.  By using website, research some disease examples about nondisjuction of sex chromosome and write a paragraph explaining why it occurs. Then draw diagram and explain process of sex chromosome separation indicating where the problem of nondisjunction occurs.