Long-haired and short-haired cats

Long-haired and short-haired cats

Pencil and paper
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Further Resources
This task is about genetics.
Cats have a gene which controls the length of their hair (fur).
The form of the gene for short-hair (H), is dominant over the form of the gene for long-hair (h). 
A cat breeder has a male and female cat. Both cats are heterozygous for hair length. These cats produced 8 kittens.
 
a)
What are the genotypes of the parent male and female cats?
 
  i)
 
ii)
male:   ____________________
 
female:    ____________________
 
b) Complete the punnet square below to show the possible genotypes in the kittens.
 
 
c) Of the 8 kittens produced, how many would be expected to have short-hair? _______
Task administration: 
This task can be completed with pen and paper.
Level:
5
Curriculum info: 
Description of task: 
Students are provided with information about a genetic trait. They develop genotypes for the parents involved and then complete a punnet square for these.
Curriculum Links: 
Science capabilities
The capabilities focus is brought about by the conversations you have and the questions you ask.
 
Capability: Interpret representations
This resource provides opportunities to discuss the use of  symbols and punnet squares in interpreting genetic relationships. 
 
Science capabilities: 
Answers/responses: 
 

Y10 (11/1999)

a)

i)
ii)

Hh
Hh

moderate
b)

i)
 
 
 
 
 
 
 
ii)

6 [or answer as in b) i)].

2 correct – difficult

1 correct – moderate

 
 

 
difficult