Introduction to Genetics

Which of these is heterozygous ?

• Tt

• TT

• tt

Which of these is homozygous ?

• Ss

• SS

The genetic makeup of an organism is its...

• heterozygous

• homozygous

• genotype

• phenotype

Tags

NGSS.HS-LS1-1

Genotype refers to the ...

• physical characteristics of an organism

• alleles an organism has

• observable traits of an organism

• way an organism will appear

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

How many alleles for a single gene do offspring receive from each parent?

• one

• two

• three

• five

Tags

NGSS.HS-LS3-1

What is a phenotype?

• The genetic make up (code)

• The physical trait

• An organism with 2 copies of the same allele

• An organism with 2 different alleles for a gene

Tags

NGSS.HS-LS3-3

Having two of the same alleles for a trait (AKA purebred).

• homozygous

• hetrozygous

• phenotype

• genotype

Having two different alleles for a trait (AKA hybrid).

• phenotype

• homozygous

• heterozygous

• genotype

G = green, g = yellow

If this gene shows complete dominance, the genotype for a yellow plant is...

• GG

• Gg

• gg

• gG

An allele whose trait only shows up when no dominant allele is present.

• hidden allele

• dominant allele

• recessive allele

• codominant allele