Download Ch 2: Heredity Worksheet 1. Chromosomes are found in the the cell

Ch 2: Heredity Worksheet
1. Chromosomes are found in the __________________________of the cell.
2. When a sperm and an egg unite it is called_________________________
3. A fertilized cell starts off as ( number) ___________________ cell.
4. ___________________exists in every cell of our body.
5. How many chromosomes are found in the nucleus of the human cell?
6. Chromosomes are made of long strand of _____________________
7. Sperm collected from the father and then injected into the mother’s
reproductive system for fertilization is called__________________.
8. _______________________________ is when eggs and sperm are fertilized in a petri
dish then placed in the mother’s uterus for further development.
9. During ____________________ the cell copies its own chromosome.
10. During____________________ sperm and egg cells form
11. The sex cell is called_______________________________.
12. _____________________________twins grow from the same zygote.
13. _____________________________ twins form when two eggs are
fertilized by two different sperm.
14. Females have two ________________________ chromosomes.
15. Males have ___________________________ chromosomes.
16. List 5 hereditary defects:
17. List three methods in which parents can test for genetic abnormalities:
18. Two versions of a gene is called an ___________________________.
19. A dominant allele is represented by __________________________.
20. A recessive allele is represented by__________________________.
21. A disorder governed by the dominant allele is a __________________________.
22. A disorder that has two recessive alleles or has one recessive allele in order to be a
carrier is a ______________________________________________________.
Punett Square
Dominant Gene Disease
(Huntington Disease) – damage to brain and nervous system
H*
h
H*
h
Recessive Gene Disease
(Cystic Fibrosis)-respiratory problems and lung infections
C
C
c*
c*