Genetics Review

An organism's phenotype describes its __________.

• genetic makeup
• physical appearance

How many chromosomes are found in human egg and sperm cells?

• 20
• 23
• 26
• 46

Tags

NGSS.HS-LS3-1

A recessive trait only shows up when __________.

• two dominant alleles are present
• one dominant allele is present
• two recessive alleles are present
• at least one dominant allele is present

Tags

NGSS.HS-LS3-1

If you cross two parents, both with genotype Bb, what percentage of children will have brown eyes?

• 25%
• 50%
• 75%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Purebred is another word for __________, while hybrid is another word for __________.

• dominant; recessive
• recessive; dominant
• homozygous; heterozygous
• heterozygous; homozygous

Tags

NGSS.HS-LS3-2

What is the phenotype for the recessive trait?

• brown eyes
• green eyes
• blue eyes

Tags

NGSS.HS-LS3-1

Tallness is dominant in pea plants and is represented by "T." What would the genotype be for a homozygous tall plant?

• Tt
• tt
• TT
• Tall 

If red flowers (R) are dominant over white, what is the probability that the offspring will be red? 

• 1 out of 4
• 2 out of 4
• 3 out of 4
• 4 out of 4

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

What is NOT a possible offspring genotype? 

• BB
• Bb
• bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the missing genotype?

• BB

• Bb

• bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2