chapter 6

Question 1

if we observe that a trait is passed from father to son we can exclude the possibility of a

Answer 1

X-linked inhertance

Question 2

What is an important characteristic of X-linked recessive traits?

Answer 2

They are not passed from father to son, because a son inherits his father’s Y chromosome, not his X

Question 3

noninvasive prenatal screening

Answer 3

directly examines fetal DNA found in maternal blood and performed in 9th and 10th week of pregnancy

Question 4

maternal blood screening tests

Answer 4

• indicates that the fetus is at increased risk of a problem
• detected by examining certain substances in the blood of the mother

Question 5

chronic villus sampling

Answer 5

• collects a large amount of fetal tissue and eliminates necessity of culturing cells
• cells of chorion are used directly for genetic tests

Question 6

Amniocentesis

Answer 6

procedure for obtaining a sample of amniotic fluid from the uterus of a pregnant women that can be cultured and used for genetic testing

Question 7

ultrasound

Answer 7

high frequency sound is beamed into the uterus an the sound waves encounter dense tissue and bounce back and transform into a picture