Monohybrid and Dihybrid Cross

What is a Punnett square used for in genetics?

• It is used to analyze the genetic makeup of the parents

• It is used to predict the possible genotypes and phenotypes of offspring.

• It is used to determine the gender of the offspring

• It is used to calculate the probability of genetic mutations

In a monohybrid cross, if one parent is homozygous dominant (BB) and the other is homozygous recessive (bb), what will be the genotype of the offspring?

• The genotype of the offspring will be BB

• The genotype of the offspring will be bb

• The genotype of the offspring will be B

• The genotype of the offspring will be heterozygous (Bb).

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In a dihybrid cross, if one parent is heterozygous for both traits (RrYy) and the other parent is homozygous recessive for both traits (rryy), what will be the genotype of the offspring?

• The genotype of the offspring will be RrYy, Rryy, rrYy, or rryy.

• RRyy

• RrYY

• rrYY

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the difference between a monohybrid cross and a dihybrid cross?

• The main difference is that a monohybrid cross results in a 3:1 phenotypic ratio, while a dihybrid cross results in a 9:3:3:1 phenotypic ratio.

• The difference is that a monohybrid cross involves only one parent, while a dihybrid cross involves two parents.

• The main difference is the number of traits being studied - one for monohybrid cross and two for dihybrid cross.

• In a monohybrid cross, the traits are not inherited from the parents, while in a dihybrid cross, the traits are inherited from the parents.

If a pea plant with yellow seeds (Y) is crossed with a pea plant with green seeds (y), what will be the genotype of the offspring?

• yy

• Yg

• Yy

• YY

Tags

NGSS.HS-LS3-1

In a dihybrid cross, if one parent is homozygous dominant for both traits (BBYY) and the other parent is homozygous recessive for both traits (bbyy), what will be the genotype of the offspring?

• BBYY

• bbYY

• BbYy

• BbYY

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

How many different types of gametes can be produced by an individual with the genotype AaBb?

• 4

• 2

• 6

• 8

Tags

NGSS.HS-LS3-2

What is the phenotypic ratio of a dihybrid cross between two individuals who are heterozygous for both traits?

• 9:3:3:1

• 1:1:1:1

• 4:4:2:2

• 6:2:2:1

Tags

NGSS.HS-LS3-3

In a monohybrid cross, if one parent is heterozygous (Tt) and the other parent is homozygous recessive (tt), what will be the genotype of the offspring?

• TT and Tt

• tt and TT

• Tt and Tt

• The genotype of the offspring will be Tt and tt.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Explain how the Punnett square is used to predict the genotypes and phenotypes of offspring in a genetic cross.

• The Punnett square is used to predict the genotypes and phenotypes of offspring by determining the outcomes for the parents' genotypes

• The Punnett square is used to predict the genotypes and phenotypes of offspring by organizing the possible combinations of alleles from the parent organisms and determining the outcomes for the offspring.

• The Punnett square is used to predict the genotypes and phenotypes of offspring by analyzing the parents' physical characteristics

• The Punnett square is used to predict the genotypes and phenotypes of offspring by randomly selecting alleles from the parent organisms

Tags

NGSS.HS-LS3-3