Genetics Unit

What is this model used to determine?

• The probability of a trait being passed on

• How many offspring will be produced by a crossing event

• The number of chromosomes that a parent will pass on to an offspring

• The probability that twins will be produced

Parent's contribute _____ of their genes to the offspring (during sexual reproduction)

• 1/3

• 3/4

• 1/2

• 1/4

Out of the 4 options, which is the smallest structure?

• Cell

• Gene

• Nucleus

• Chromosome

Each body cell of a Blue King Crab contains 104 chromosomes. How many chromosomes are contained in a Blue King Crab sex cell?

• 46

• 23

• 60

• 52

A gene is...

• A structure that carries a single unit of hereditary information, composed of DNA

• A double-stranded molecule composed of genetic material

• An organelle that contains genetic material

• A specialized cell produced through mitosis

Choose 2 statements that accurately describe asexual reproduction

• Requires 1 parent

• Requires 2 parents

• Produces genetically identical offspring

• Produces genetically unique offspring

Compared to the amount of chromosomes in a human body cell, a human sex cell contains _____ of the amount of chromosomes. Write a fraction.

Draw the structure of DNA

What percentage of offspring are predicted to show the dominant trait in this cross?

• 25%

• 50%

• 75%

• 100%

Key:

A - Red fur

a - White fur

What percentage of offspring are predicted to have white fur?

• 100%

• 25%

• 50%

• 0%