Monohybrid and dihybrid cross

When a person has two different alleles for a gene, they are said to be

• heterozygous
• homozygous

A __________ allele always shows up in an organism when the it is present.

• dominant
• hybrid

In a dihybrid cross

• one trait is crossed.
• two traits are crossed.
• four boxes are needed for the punnett square.
• mom's alleles are dominant.

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

What allele combination should go in the missing box?

• AA
• Aa
• aa
• none of these

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the dominant trait?

• yellow pea seeds
• green pea seeds
• there is no dominant seed
• Jolly green giant

Tags

NGSS.HS-LS3-1

This image shows a...

• Punnett Square
• Phenotype
• Genotype
• Dominant allele

Tags

NGSS.HS-LS3-3

An organism’s genetic makeup or allele combination.

• Genotype
• Phenotype
• Beanotype
• Notype

Tags

NGSS.HS-LS1-1

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

Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what are the expected phenotype percentages for the offspring of a heterozygous hairy plant and a hairless plant?

• 100% hairy, 0% hairless
• 75% hairy, 25% hairless
• 50% hairy, 50% hairless
• 25% hairy, 75% hairless

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2