Basic Genetics

Question 1

Functional unit of inheritance or heredity made up of DNA that is found within a chromosome.

Answer 1

Gene

Question 2

Structure of DNA

Answer 2

2 polynucleotides coiled up forming double helix

Question 3

It is composed of simpler units called nucelotides

Answer 3

DNA

Question 4

The only time a recessive allele is expressed as phenotype

Answer 4

homozygous recessive

Question 5

T/F:
I. Phenotype always expresses the dominant allele
II. The only time a recessive allele is expressed as phenotype is when it is heterozygous

Answer 5

I true, II false

• The only time a recessive allele is expressed as phenotype is when it is HOMOZYGOUS recessive

Question 6

In which stage of meiosis does “crossing over” happen

Answer 6

Prophase 1 of meiosis