7th Grade Science - Genetics

Which of the following is a phenotype?

• BB
• Bb
• bb
• Blue eyes

Having two of the same genes for the trait - RR or rr.

• homozygous

• hetrozygous

• protein

• chromosome

Having two different genes for a trait.

• protein

• homozygous

• heterozygous

• genotype

Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?

• 50% tall and 50% short
• 75%tall and 25% short
• 100%short

This is an example of what?

• Complete dominance
• Incomplete dominance
• Codominance
• None of the above

What is the genotype for this organism?
(E= 3 eyes, e= 1 eye)

• EE
• Ee
• ee
• EE or Ee

Mendel is most famous for...

• Discovering the structure of DNA

• Studying peas

• Cloning Dolly

• Growing corn

Which disorder is due to an extra chromosome at the 21st pair?

• Sickle Cell

• Color Blindness

• Cystic Fibrosis

• Down Syndrome

HH is a genotype and would be referred to as being...

• Homozygous Dominant

• Heterozygous

• Homozygous Recessive

• Alleles

Which of the following are located on chromosomes?

• zygotes

• pedigrees

• genes

• alleles