Heredity Unit - Concept 1: Punnett Squares

The form of a gene that is always expressed

• heterozygous

• dominant

• recessive

• homologous

The Mendelian law that BEST explains why an organism with ‘Yy’ will show only the dominant phenotype

• Law of Independent Assortment

• Chromosome Theory of Heredity

• Law of Dominance

• Law of Segregation

The genotype of an organism that inherits one dominant allele and one recessive allele for hair color

• Homozygous

• Homologous

• Haploid

• Heterozygous

Tags

NGSS.HS-LS3-1

Two pea plants are crossed that are both heterozygous for round seeds. If round is dominant over wrinkled, what are the expected phenotypic results?

• 100% round

• 75% round, 25% wrinkled

• 50% round, 50% wrinkled

• 25% round, 75% wrinkled

Tags

NGSS.HS-LS3-3

Two parents have the genotype Rr for a genetic disorder caused by a recessive allele. What is the chance that any of their children will inherit the disorder?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

The Mendelian law that states that while organisms inherit two copies of each gene (one from each of their parents), they only donate one copy to each of their offspring

• Law of Dominance

• Law of Independent Assortment

• Law of Segregation

• Chromosome Theory of Heredity

Tags

NGSS.HS-LS3-1

The Mendelian law based on the fact that homologous chromosomes line up RANDOMLY during metaphase

• Law of Dominance

• Law of Independent Assortment

• Law of Segregation

• Chromosome Theory of Heredity

Tags

NGSS.HS-LS3-2

In horses, the allele for smooth hair (H) is dominant to the allele for curly hair (h). A curly-haired stallion and a smooth-haired mare mate. If the predicted probability for the hair texture of their offspring is 50% curly-haired and 50% smooth-haired, what must be the genotypes of the parents to create this phenotypic ratio?

• HH x hh

• Hh x hh

• HH x Hh

• Hh x Hh

Tags

NGSS.HS-LS3-3

Consider two heterozygous parents. Each has a dominant allele (F) for no freckles and a recessive allele (f) for freckles. What would the genotypic ratio of the offspring be?

• 100% Ff

• 25% FF, 50% Ff, 25% ff

• 50% FF, 50% Ff

• 50% Ff, 50% ff

Tags

NGSS.HS-LS3-3

A trait that is NOT expressed when a dominant allele is present

• co-dominant

• dominant

• recessive

• homologous