Mendelian Genetics and Punnett Squares

In Mendelian Genetics (Named after Gregor Mendel), what is a dominant trait?

• A trait or characteristic that will appear in the offspring if one or both of the parents contributes it.

• The trait or characteristic that takes charge and all other traits follow.

• The trait or characteristic that asserts itself in the group of traits.

• The trait or characteristic that appears to disappear in the offspring.

Identify the answer below that correctly represents a recessive trait in Mendelian genetics.

• 3 (Number)

• T (Capital Letter)

• # (Symbol)

• t (Lower Case Letter)

Select the allele combination below that represents homozygous dominant.

• aa

• Aa

• AA

• 32

Select the allele combination below that represents homozygous recessive.

• aa

• Aa

• AA

• 32

The letters on the TOP AND SIDE of a punnett square represent ______________.

• The combination of alleles in offspring.

• The possible alleles given by the parents following meiosis.

• The genotype and phenotype of offspring.

• The results of genetic mutations in offspring.

This image shows a...

• Punnett Square

• Phenotype

• Genotype

• Dominant allele

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is a Punnett Square used for in Mendelian Genetics?

• A tool used in genetics to draw squares.

• A mathematical equation used to identify whether offspring resulted from mitosis or meiosis.

• A Punnett Square allows the prediction of the percentages or probability of phenotypes in the offspring from known genotypes.

• A square used to organize all the genes in a numerical sequence from the lower number to the highest number.

You create a punnett square to determine the probability of hair color being passed to offspring. Brown hair color is dominant. Blond hair is recessive. Both parents have brown hair. The mother is homozygous dominant. The father is heterozygous. What is the probability that the offspring will have brown hair?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

You create a punnett square to determine the probability of hair color being passed to offspring. Brown hair is dominant. Blond hair is recessive. Both parents have brown hair. Both parents are heterozygous. What is the probability that the offspring will also have brown hair?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

You create a punnett square to determine the probability of hair color being passed to offspring. Brown hair is dominant. Blond hair is recessive. Both parents have brown hair. Both parents are heterozygous. What is the probability that the offspring will have blond hair?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3