Exploring Bio-Genetics and Punnett Square Fundamentals

What are traits controlled by?

• Genes

• Enzymes

• Proteins

• Cells

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

NGSS.HS-LS3-2

How many versions do many genes have?

• Three

• Two

• One

• Four

What is a Punnett square used for?

• To predict the possible genotypes of offspring

• To identify dominant traits

• To determine the number of chromosomes

• To measure the length of DNA

In a monohybrid cross, what percentage of offspring would have blue eyes if one parent is heterozygous (Bb) and the other is homozygous recessive (bb)?

• 25%

• 50%

• 100%

• 75%

Tags

NGSS.HS-LS3-1

What does it mean if an organism is heterozygous for a trait?

• It has three alleles for a trait

• It has no alleles for a trait

• It has two different alleles for a trait

• It has two identical alleles for a trait

What is the purpose of a dihybrid Punnett square?

• To predict the possible genotypes for two traits

• To determine the length of DNA

• To predict the number of offspring

• To identify the number of chromosomes

Tags

NGSS.HS-LS3-3

Which of the following is a dominant allele for guinea pig fur length?

• l

• L

• R

• r

If both parents are heterozygous for two traits, how many possible combinations of alleles can their offspring have?

• 8

• 12

• 16

• 4

Tags

NGSS.HS-LS3-2

What percentage of offspring are expected to show the recessive characteristic for both traits in a dihybrid cross?

• 6%

• 24%

• 12%

• 18%

Tags

NGSS.HS-LS3-3

Why do we use dihybrid Punnett squares?

• To determine the length of DNA

• To predict the number of offspring

• To predict the possible genotypes and phenotypes for two traits

• To identify the number of chromosomes