Question 1 (10 marks). The normal color of snapdragons is red.
Some pure lines showing variations of flower colour have been found .
When these lines were crossed they gave the following results.

What is the mode of inheritance: ______________________________

Write the genotypes of the parents, the F1 and the F2 in the places provided.
 
 

	Parents	F1	F2
Phenotypes: Genotypes:	Orange X Yellow ______ X ______	Orange ______	3 orange: 1 yellow ______ : ______
Phenotypes: Genotypes:	Red X Orange ______ X ______	Red ______	3 red: 1 orange ______ : ______
Phenotypes: Genotypes:	Red X Yellow ______ X ______	Red ______	3 red: 1 yellow ______ : ______
Phenotypes: Genotypes:	Red X White ______ X ______	Red ______	3 red: 1 white ______ : ______
Phenotypes: Genotypes:	Yellow X White ______ X ______	Red ______	9 red: 3 orange: 4 white ______ : ______ : ______
Phenotypes: Genotypes:	Orange X White ______ X ______	Red ______	9 red: 3 orange: 4 white ______ : ______ : ______
Phenotypes: Genotypes:	Red X White ______ X ______	Red ______	9 red: 3 yellow: 4 white ______ : ______ : ______

For answer see the Quiz answer sheet!
Question 1b (10 marks).  Some Himalayan rabbit breeds have either black or red-furred extremities.
The following is the result of a set of carefully done experiments.
Write the genotypes of the parents, the F1 and the F2 in the places provided.

	Parents	F1	F2
Phenotypes: Genotypes:	Himalayan black X albino ______ X ______	Himalayan black ______	3 Himalayan black: 1 albino ______ : ______
Phenotypes: Genotypes:	black X Himalayan black ______ X ______	black ______	3 black: 1 Himalayan black ______ : ______
Phenotypes: Genotypes:	black X albino ______ X ______	black ______	3 black: 1 albino ______ : ______
Phenotypes: Genotypes:	Himalayan red X albino ______ X ______	Himalayan red     ______	3 Himalayan red: 1 albino ______ : ______
Phenotypes: Genotypes:	red X Himalayan red ______ X ______	red ______	3 red: 1 Himalayan red ______ : ______
Phenotypes: Genotypes:	red X albino ______ X ______	red ______	3 red: 1 albino ______ : ______
Phenotypes: Genotypes:	black X red ______ X ______	black ______	3 black: 1 red ______ : ______
Phenotypes: Genotypes:	red X Himalayan black ______ X ______	black ______	9 black: 3 Himalayan black: 3 red: 1 Himalayan red ______ : ______ : ______ : ______
Phenotypes: Genotypes:	red X albino ______ X ______	black ______	9 black: 3 red: 4 albino ______ : ______ : ______
Phenotypes: Genotypes:	Himalayan black X Himalayan red ______ X ______	Himalayan black ______	3 Himalayan black: 1 Himalayan red ______ : ______

The best way to describe the relationship between the Himalayan condition and coat colour is ________________________________.
The best way to describe the relationship between the albino condition and coat colour is ________________________________.
The best way to describe the relationship between the Himalayan and albino traits is ________________________________.

For answer see the Quiz answer sheet!

Question 2 (10 marks). A mutant allele in mice causes a kinked tail when compared to the normal straight tail.
Six pairs of mice were crossed to investigate the genetic basis of the kinked tail phenotype.
The phenotypes of the parents and progeny are listed below.
 

Cross	female parent	male parent	female progeny	males progeny
1  Genotypes:	normal tail	kinked tail	All kinked tail	All normal tail
2  Genotypes:	kinked tail	normal tail	half kinked half normal	half kinked half normal
3  Genotypes:	kinked tail	normal tail	All kinked tail	All kinked tail
4  Genotypes:	normal tail	normal tail	All normal tail	All normal tail
5  Genotypes:	kinked tail	kinked tail	All kinked tail	All kinked tail
6  Genotypes:	kinked tail	kinked tail	All kinked tail	half kinked half normal

What is the mode of inheritance: ______________________________
Give the Genotypes of Parents and Progeny in the places available in the chart.

For answer see the Quiz answer sheet!

Question 3 (10 marks). This pedigree deals with a very rare trait.

What is the mode of inheritance: ______________________________

In this pedigree, the probability that indicated individual is a carrier is Ö
 
 

Individual Designation	Probability of being a carrier
II.5
II.8
III.5
IV.5
IV.11

For answer see the Quiz answer sheet!