Reference no: EM132256930

ASSIGNMENT

Inheritance Patterns Assignment

Monohybrid Crosses

Watch the Punnett Square video posted in ulearn. Using the basic rules explained in the video, complete the following punnett squares and answer the questions following each.

1. Let's assume we are crossing two pea plants: One is homozygous for a dominant trait, yellow pea pods. The other is homozygous for a recessive trait, green pea pods.

2. What are the possible phenotypes of the offspring in the cross above and what percentage of the offspring have each phenotype?

3. What are the possible genotypes of the offspring in the cross above and what percentage of the offspring have each genotype?

4. Let's assume we are crossing two of the offspring from the cross in question 1.

5. What are the possible phenotypes of the offspring in the cross above and what percentage of the offspring have each phenotype?

6. What are the possible genotypes of the offspring in the cross above and what percentage of the offspring have each genotype?

Dihybrid Crosses

Let's assume we are crossing two pea plants: One is homozygous for two dominant traits, yellow pea pods and tall stems. The other is homozygous for two recessive traits, green pea pods and short stems.

7. First thing we need to do is determine the possible gametes formed by each individual.

8. Now that you have the gametes, we can do the cross:

9. What are the possible phenotypes of the offspring in the cross above and what percentage of the offspring have each phenotype?

Let's assume we are crossing two of the offspring from the cross in question 8.

10. Again, we need to determine the gametes:

11. Now that you have the gametes, we can do the cross:

12. What are the possible phenotypes of the offspring in the cross above and what is the ratio of the offspring that have each phenotype?

Codominance

When codominance occurs, two nonidentical alleles of a gene are both fully expressed in heterozygotes. A good example of codominance is ABO blood types.

13. First, let's determine the possible genotypes of each blood type. (HINT some may have two possibilities

A
B
AB
O

14. A man with AB blood marries a woman with O blood.

15. What are the possible blood types their children could have and at what ratios?

16. My husband, Dan, has A blood. I have O blood. Hint: you need to use both Punnett Squares.

17. What types of blood could our children have and at what ratios?

X-linked Inheritance

Some genes are carried on the sex chromosomes X and Y, and are therefore passed along based on what sex the offspring turns out to be. Colorblindness and Hemophila A are good examples of disorders caused by genes carried on the X chromosome.

18. First, let's determine the possible genotypes of each of the following:

Colorblind Male

Normal Male

Colorblind Female

Normal Female

Carrier Female

19. A colorblind male and a normal female have a child.

20. What are the chances their children would be colorblind, normal or a carrier?

21. A colorblind male and a carrier female have a child.

22. What are the chances their children would be colorblind, normal or a carrier?

23. A normal male and a colorblind woman have a child.

24. What are the chances their children would be colorblind, normal or a carrier?

Attachment:- Punnett Squares.rar