Monohybrid and Dihybrid Crosses

Select the following option(s) that is/are considered to be homozygous.

• BB

• Bb

• bb

Select the following option(s) that is/are considered to be heterozygous.

• BB

• Bb

• bb

What is considered to be the phenotype?

• Double stranded chromosomes

• The physical trait that is expressed

• The combination of genes

• All of the genetic information

Tags

NGSS.HS-LS3-3

NGSS.HS-LS4-4

What does it mean to be a "purebred" (select all that apply)

• To have two of the same alleles

• To have different alleles

• Offspring of two of the same purebreds would be identical to their parents

• Offspring of two of the same purebreds would be different to their parents

Tags

NGSS.HS-LS3-1

In guinea pigs, the allele for short hair is dominant over the allele for long hair.
B = short 
b = long
What would the cross be for two heterozygous guinea pigs?

• BB X BB
• BB X Bb
• Bb X Bb
• bb X bb

Tags

NGSS.HS-LS3-1

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

Which of the following genotypes is homozygous dominant?

• A
• Aa
• AA
• aa

Which of the following is homozygous recessive?

• Tt
• tt
• TT
• T

An organism’s genetic makeup, or allele combinations

• Recessive
• Genotype
• Phenotype
• Heterozygous

Tags

NGSS.HS-LS3-2

What are the possible genotypes for this cross?

• TT = 25% Tt= 50% tt=25%
• all tall
• TT= 75% tt = 25%
• Tt = 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3