Genetics

When an organism has 2 identical alleles that are dominant, it's genotype is?

• Heterozygous

• Homozygous Recessive

• Homozygous Dominant

• None of the above

A genetic trait that is found on the X or Y chromosome is called what?

• Somatic

• Gamete

• Polygenic

• Sex-Linked

Which statement is FALSE regarding sex cells?

• They are sperm and egg

• They are known as somatic cells

• They are haploid

• They are produced in meiosis

Tags

NGSS.HS-LS3-2

Which statement is TRUE?

• RR is a phenotype

• Rr is a heterozygous genotype

• rr is a homozygous dominant genotype

• Round is a genotype

Tags

NGSS.HS-LS3-2

Which trait is NOT Polygenic?

• Height

• Hair Color

• Eye Color

• Attached Earlobes

If a heterozygous genotype results in a blended phenotype, what inheritance pattern is represented?

• Simple Dominance

• Incomplete Dominance

• Codominance

• There is no way to know

Which statements are TRUE about simple dominance?

• It takes 1 allele to express a recessive trait

• It takes 2 alleles to express a recessive trait

• Recessive Traits are more common than Dominant Traits

• Recessive alleles are expressed with lowercase letters

If T = tall and t = short, cross a TT parent, with a tt parent. What is the % chance that the offspring will be short?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

If R = round and r = wrinkled. Cross two heterozygous parents. What is the genotypic ratio for the offspring?

• 1

• 1:1

• 3:1

• 1:2:1

Tags

NGSS.HS-LS3-3

If R = round and r = wrinkled. Cross two heterozygous parents. What is the phenotypic ratio for the offspring?

• 1

• 1:1

• 3:1

• 1:2:1