Pre-Test Genetics

The different forms of a gene are known as _____________.

• Codons
• Proteins
• Alleles
• Nucleotides

Which of the following is an example of a GENOTYPE?

• 25%

• Blue flowers

• 1:2:1 ratio

• B b or B B

Which of the following is an example of a PHENOTYPE?

• 25%

• blue flower color

• 1:2:1 ratio

• B b or B B

The letters on the TOP AND SIDE of a punnett square represent ______________.

• The combination of alleles in offspring.

• The possible alleles given by the parents

• The genotype and phenotype of offspring.

• The results of genetic mutations in offspring.

What are genes?

• Double helix

• food

• A section of DNA

• the study of genetics

A dominant trait is:

• Is expressed even when only one allele is present

• Is only expressed if it is the only allele present

• the result of two recessive alleles together

• 2 the result of two alleles which are the same

The definition of an allele is:

• A feature of an organism that can be physical or behavioural

• A large structure of DNA nmolecules visialbe during cell division

• Alternative forms of the same gene found at the same point on a pair of chromosomes

• A specific segment of DNA providing instruction for a single trait

A human usually has _____ total chromosomes.

• 6
• 22
• 4
• 46

_____________________ is the appearance of an organism, or how it looks

• phenotype
• ratio
• recessive trait
• heredity

Is this considered Homozygous or Heterozygous?

B b

• Homozygous

• Heterozygous