U3W6D1- Bio

Warm Up Questions

Open Ended

What is the difference between Heterozygous and Homozygous? 

Open Ended

What is the difference between genotype and phenotype?

Multiple Choice

Take a guess:

If I cross a plant that is Homozygous recessive short with a heterozygous for height plant, what would be the ratio of tall to small plants?

• 1 : 1

• 2 : 1

• 1 : 2

• 3 : 1

Monohybrid Crosses

In your notes you will need to fill out the Punnett squares provided with the 3 different examples of monohybrid crosses and describe the outcomes of each

Multiple Choice

In pea plants, spherical seeds (S) are dominant to dented seeds (s). In a genetic cross of two plants that are heterozygous for the seed shape trait, what fraction of the offspring should have spherical seeds?

• All offspring are spherical

• 3/4

• 1/2

• 1/4

Multiple Choice

In a dihybrid cross, how many different combinations of alleles can result from the gametes of each parent?

• 2

• 8

• 16

• 24

Open Ended

What is a Punnett square, and what is its purpose in genetics?

Open Ended

Explain the difference between genotype and phenotype, and how they relate to Punnett squares.