Honors Biology Genetics

Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What percentage of the offspring of the cross BbTt x BBtt will have black fur and long tails? Please show your work on a sheet of paper.

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Cross Two Homozygous plants (RRYY x rryy)R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seedsWhat percent will have Round and Yellow seeds? Please show your work on a sheet of paper.

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.MS-LS3-2

In Holstein cattle the allele for black hair color (B) is dominant over the allele for red hair color (b), and the allele for polled (P), or lacking horns, is dominant over the allele for having horns (p). What is the expected phenotypic ratio of the offspring of a BbPp X BbPp cross if these alleles sort independently? Please show your work on a sheet of paper.

• 16 black/polled : 0 black/horned : 0 red/polled : 0 red/horned

• 12 black/polled : 0 black/horned : 0 red/polled : 4 red/horned

• 4 black/polled : 4 black/horned : 4 red/polled : 4 red/horned

• 9 black/polled : 3 black/horned : 3 red/polled : 1 red/horned

Tags

NGSS.HS-LS3-3

A long-haired female rabbit and a short-haired male rabbit produced this offspring with a medium-length coat:

• Incomplete dominance

• Codominance

• Complete dominance

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of Mendel's laws states that alleles are distributed to gametes independent of one another?

• Law of Dominance

• Law of Segregation

• Law of Independent Assortment

Which of Mendel's laws states that alleles are separated during meiosis?

• Law of Dominance

• Law of Segregation

• Law of Independent Assortment

A heterozygous yellow pea plant's genotype would be:

• YY

• yy

• Yy

• Yg

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Start with the P generation with the following genotypes (AA x aa). Based on classical Mendelian inheritance, how will a cross between two homozygous parents, one dominant, one recessive, influence future generations?

• The F1 generation will show an even split between the dominant phenotypes and the recessive genotype.

• The F1 generation will show the dominant trait and future crosses will continue to produce genotypes expressing the dominant trait.

• Although the F1 generation will all show the dominant trait, the offspring will all be heterozygous and increase the chances of future variation.

• The F1 generation will show a mix of the dominant phenotype and recessive phenotype and over generations, the recessive trait will increase in number.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is a phenotype?

• The genetic make up (code)

• The physical trait

Tags

NGSS.HS-LS3-3

NGSS.HS-LS4-4

Having two different genes for a trait (sometimes called hybrid).

• protein

• homozygous

• heterozygous

• genotype