Definitions: Write the Definitions of the Following Words

Name:______Period:______

Review Genetics (7th grade) Definitions: Write the definitions of the following words.

1. Allele ______

______

2. Genetics______

______

3. Genotype______

______

4. Offspring______

______

5. Phenotype______

______

6. Dominant trait______

______

7. Recessive trait______

______

8. Genes ______

______

9. Asexual Reproduction ______

______

10. Reproduction______

______

11. DNA ______

______12. Adaptation

______

13. Heterozygous

______

14. Homozygous______

______

15. Who is known as the father of Genetics? ______

16. Purebred______

17. Hybrid ______

18. Phenotype- genotype. Write all of the genotype possibilities for each phenotype presented. Use (G) for the dominant possibilities and a (g) for the recessive possibilities.

a. In wildcats gray fur is dominant ______

b. In wildcats brown fur is recessive ______

c. The dog’s pointy ears are a recessive trait. ______

d. The cat’s pointy ears are a dominant trait.______

e. Round eyes are a dominant trait. ______

19. Genotype – phenotype. Write the phenotype for the genotype presented… In Guinea pigs, black hair (B) is dominant over white (b) Rough coat texture (R) is dominant over smooth (r) and short hair (S) is dominant over long hair (s).

a. Bb ______

b. Rr______

c. Bb______

d. SS______e. Rr______

f. Ss______

20. Crossings: Remember every time you work on a Punnett square you have to write the genotypes.

a. Bb x Bb c. Bb x BB

b. BB x bb d. bb x Bb

23. One of SpongeBob’s cousins, SpongeBillyBob, recently met a cute squarepants gal, SpongeGerdy, at a local dance and fell in love. Use your knowledge of genetics to answer the questions below.

(a) If SpongeGerdy’s father is a heterozygous squarepants and her mother is a roundpants, what is her genotype? Complete the Punnett square to show the possible genotypes that would result to help you determine Gerdy’s genotype.

What is Gerdy’s genotype? ______

(b) SpongeBillyBob is heterozygous for his squarepants shape. What is his genotype? ______

(c) Complete the Punnett square to show the possibilities that would result if Billy Bob & Gerdy had children.

(d) List the possible genotypes and phenotypes for the kids.

(e) What is the probability of kids with squarepants? ______%

(f) What is the probability of kids with roundpants? ______%

24. SpongeBob’s aunt is famous around town for her itty, bitty stubby nose! She recently met a cute squarepants fellow who also has a stubby nose, which is a recessive trait. Would it be possible for them to have a child with a regular long nose? Why or why not? Create a Punnett square to help you. 25. Think!! a. A punnett Square shows you all the ways in which ______can combine.

b. In a Punnett Square, the lower-case letter stands for the ______trait.

c. Of the following, which represents a recessive genotype? TT Tt tt

d. A yellow pea plant (Yy) and a green pea plant (yy) could produce ______green offspring.

e. Based on this cross, what genotype goes in compartment 1? ______

f. Based on this cross above, what genotype goes in compartment 4? ______

g. In the genotype the capital letter stands for the ______allele.

h. If the man has brown eyes, but has a blue-eyed child what must his genotype be? (use a punnet square to help you)

i. In dogs, there is a hereditary deafness caused by a recessive gene, “d.” A kennel owner has a male dog that she wants to use for breeding purposes if possible. The dog can hear, so the owner knows his genotype is either ______or ______.

j. A man and woman living in a tropical area where malaria is prevalent and health care is not accessible have four children. The genotypes of these children are ss, Ss, Ss, and SS. What must the genotype of both parents be? ______