1. Reproduction and Heredity
Unit 2 Review
P #1-21

2. Unit 2 Review
DNA
Ratio
Clone
Meiosis
Asexual D A C D B B A

3. Unit 2 Review
Transcription and Translation results in making/building of proteins.
1)The genetic information is transferred in the nucleus from DNA to mRNA during transcription ) mRNA carries the information to rRNA in the ribosome )tRNA brings amino acids to the ribosomes, where protein chains are assembles during translation
Transcription takes place in the nucleus (DNA and mRNA).
Translation takes place in the ribosomes – in the cytoplasm of the cell (tRNA, mRNA, rRNA).

4. Unit 2 Review
Straight hair is controlled by a recessive allele because the offspring of a parent with straight hair and a parent with curly hair will most likely have curly hair. A recessive trait can appear in an offspring of two parents (carriers) who do not exhibit the trait. The trait cannot be sex- linked because both males and females express the straight hair phenotype.

5. Unit 2 Review 20) Biotechnology has advantages and disadvantages
Positive Effect: Mosquitoes can be genetically engineered so they do not spread malaria
Negative Effect: If a gene from a plant that people are allergic to is inserted into a different kind of plant, people could become allergic to that plant

6. Unit 2 Review
Free hanging earlobes are inherited as a dominant trait
Phenotype Ratio:
3:4 free hanging
1:4 Attached AA Aa
free-hanging
free-hanging Aa aa
free-hanging
attached