1. REVIEW PUNNETT SQUARES

2. How many alleles are needed to
represent a trait? 2

3. one allele from each parent
When Gregor Mendel crossed a purple plant with a white plant, the offspring inherited
one allele from each parent

4. CODOMINANCE

5. INCOMPLETE DOMINANCE

6. INCOMPLETE DOMINANCE RR ? WW ? RW ?
Genotypes?

7. OO BB
Genotypes?
CODOMINANCE BO

8. CODOMINANCE
Genotypes? RR BB RB

9. INCOMPLETE DOMINANCE
Genotypes? RR WW RW

10. Rr and Rr Rr and rr rr and rr 1.
If the alleles for the color of a flower are rr , what is true of its parents?
The genotype of both parents
contained a recessive allele.
Rr and Rr or
Rr and rr or
rr and rr

11. 2. B b
Black fur color is dominant and brown fur color is recessive. A black mouse is crossed with a brown mice. The offspring is brown. bb
Alleles?
What is the genotype of the black mouse?
BB or Bb

12. B b Bb 3. What is the genotype of the male parent?
In squirrels, brown fur color is dominant to gray A male brown squirrel and a female gray squirrel mate. They have both brown babies and gray babies.
Alleles?
What is the genotype of the male parent? Bb

13. 4. T t
A tan monkey is mated with a white monkey All of their offspring are tan.
Tan is dominant
Alleles?
What are the genotypes of the parents?
TT ,
tan monkey - tt
white monkey - Tt
What are the genotypes of the offspring?

14. 5.
 Two parents are found to be carriers of a genetic disorder caused by a recessive allele (m).
Offspring born with two recessive alleles die before becoming old enough to reproduce.
What is the likelihood of these parents having an
offspring with the disorder?
What is the genotype of the offspring with disorder? mm Mm
What is the genotype of the parents? Mm Mm ? X

15. Man is IAi Woman is IBi 6. A man with type A blood and a
woman with type B blood have a type O child What are the genotypes of the parents?
Man is IAi
Woman is IBi

16. Woman is IBi Man is ii 7. A woman who is type B has children with a
man who is type O.
They have both type B and type O children.
What are the genotypes of the parents?
Woman is IBi
Man is ii

17. Wavy hair 8. In humans, the allele C (curly hair )
exhibits incomplete dominance over
the allele S (straight hair).
What type of hair will an individual
with genotype CS have?
Wavy hair
The phenotype would be intermediate
between the two.

18. ? codominance BB YY BY BB BY 9.
Genotypes? BB YY BY X
Blue petunias crossed with yellow petunias produces blue and yellow petunias.
This is an example of
codominance
When a blue petunia and a blue and yellow petunia are crossed, the genotypic ratios of the offspring are:
Genotypes? BB BY ? X

19. BB YY BY BY YY ? 10. Incomplete dominance
When a plant with blue flowers mates with a plant with yellow flowers, all the offspring produced are green.
This is an example of
Incomplete dominance BB YY BY X
A plant with green flowers mates with a plant with
yellow flowers. What percent of the plants produced will have yellow flowers? BY YY ? X

20. 11. Y
In daisies, yellow flower color is dominant to white. You cross a plant with white flowers with a plant heterozygous for yellow flowers. What percent of the offspring would have white flowers? y
Alleles? yy Yy ? X
If these two plants produced 1000 offspring, how many would be white?
500

21. ? G g Gg gg 12. Green is dominant to yellow.
A hybrid green plant is crossed with a yellow one What % of the offspring are yellow?
Alleles?
Genotype of the parents? ? Gg gg X