Key Area 2.5 :Variation and Inheritance
Homework 7:
1. Explain what is meant by the terms discrete and continuous
variation.
2. What name is given to the basic unit of inheritance that controls
a characteristic that is passed on from generation to generation ?
3. a) What is the term used to refer to the different forms of a gene ?
b) How many forms of a gene does a zygote receive from each
parent ?
4. The cross below involves the gene for coat colour in cattle.
(2)
(1)
(1)
(1)
F1 = All black bulls
a) State the two phenotypes of coat colour in this cross.
b) Which form of the gene for coat colour is dominant ?
c) Using symbols of your choice draw a keyed diagram to
represent the cross.
(2)
(1)
(2)