NAME:______________________________________________________CLASS:________________

1.                  What is an allele?

2.                  What is a purebred?

3.                  Identify a trait controlled by multiple alleles.

4.                  Identify a sex-linked trait.

5.                  What is the genotype for Down’s Syndrome?

6.                  What is genetic engineering?

7.                  Why do use DNA fingerprinting?

8.                  What is a pedigree?

9.                  Identify a helpful mutation.

10.              What is the end result of meiosis?

11.              What is the first step of protein synthesis?

12.              In the genetic code, a group of 3 nitrogen bases codes for the attachment of an________________.

13.              Phenotype is ___________________________________________.

14.              A dominant allele is a trait that ___________________________________________________________________________.

15.              What is a clone?

16.              Sex-linked traits are more common in __________________.

17.              What is a mutation?

18.              How do you write 2 recessive alleles?

19.              Identify the 4 nitrogen bases in DNA.

20.              What is the genotype of a male?

21.              A person with “B” blood can have the genotype _________or_________.

22.              How many chromosomes do the characters in Sesame Street have?

23.              Which trait is located on the “X” chromosome in the Sesame Street?

Draw a punnett square for the following problem:

      24.   Mommy cat is homozygous for short hair and daddy cat is heterozygous for long hair.

                                    H = short hair         h = short hair

              What are the genotypes of the offsping?   What are the phenotypes?

              Suppose dad is homozygous for long hair.  Draw a punnett and determine the genotype and phenotype.

SHORT ANSWERS

24.              Mom has “AB” blood, Dad has “O” blood.  Draw a punnett to show the geno and pheno of children.

25.              Why can’t a male be a carrier for a sex-linked trait?

26.              Why is there research being done on telomeres?

27.              Why  is “ gene therapy” so controversial?

28.              List an advantage and disadvantage of cloning.

29.              Why couldn’t Wilmut take a sex cell from sheep 1 to clone Dolly?

30.              Why did Wilmut remove the nucleus from the egg cell from Sheep 1?

31.              Was Dolly the clone of sheep 3?  Explain.

32.              Why is porphyria  known as the “vampire gene”?

33.              Draw a punnett square to show the cross between  a hemophiliac male and a carrier female.  Calculate the percentages of male and female hemophiliacs.  Don’t forget to use “XX” and “XY” in your cross!

H = normal allele        h = hemophelia