Introduction to genetics

which is heterozygous ?

• Tt

• TT

Which is homozygous ?

• Zz

• SS

the genetic makeup of an organism

• heterozygous

• punnet square

• genotype

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Genotype refers to the ...

• physical expression of the genes

• the possible combination of alleles in a gene

• whether an allele is dominant or recessive

• how an organism will appear

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS4-3

An offspring will receive how many alleles from each parent to determine a specific trait?

• one

• two

• three

• five

Tags

NGSS.HS-LS3-1

What is a phenotype

• The genetic make up (code)

• The physical trait

G = green, g = yellow

This gene shows complete dominance. The genotype for a yellow plant is...

• GG

• Gg

• gg

• all of the choices result in yellow

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

• hidden allele

• dominant allele

• recessive allele

• present allele

B=brown eyes
b= blue eyes
What is true about two brothers that have brown eyes?
One has genotype BB the other Bb.

• they have same phenotype and genotype
• they have different genotypes and phenotypes
• they have same phenotype but different genotypes
• they have same genotype but different phenotypes

Tags

NGSS.HS-LS3-1

What does heterozygous mean?

• An organism that has the same genes for a trait (TT or tt)
• An organism that has different genes for a trait (Tt)
• When neither gene is fully dominant; offspring is a mixture of both
• the different forms of a trait (hair color--> brown, blonde, red