Mendelian Pattern of Inheritance

When is a recessive allele expressed in offspring?

• when two copies are present
• when parents have no dominant alleles
• when the offspring is heterozygous
• when one copy is present

Recessive alleles may not be expressed because they are

• masked by a dominant allele
• the least common allele in a population.
• the most common allele in a population.
• less likely to have crossing over.        

Which of the following events is an important factor in increasing genetic diversity among sexually reproducing organisms

• crossing over
• testcross
• genetic linkage
• mitosis

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-2

How many children did individuals I-1 and I-2 have?

• 2
• 4
• 6
• 8

Name the two individuals that should be marked as carriers of hitchhiker's thumb.

• III-2 and III-3
• II-1 and II-2
• III-1 and III-2
• I-1 and I-2

A couple has two children, both of whom are boys. What is the chance that the parents' next child will be a boy?

• 0%
• 50%
• 25%
• 75%

The type of inheritance shown when a red-flowered plant is crossed with a white-flowered plant and only pink flowers are produced is _____.

• inbreeding
• incomplete dominance
• polygenic inheritance
• multiple alleles

If two checkered chicks (BW) are crossed, what are the offspring?

• 100% checkered
• 50% white, 50% black
• 25% white, 50% checkered, 25% black
• 100% grey

If Norma has Huntington's disease (Hh) and her husband, Bob, does not, what is the chance that their only son, James, will inherit Huntington's?

• 50%
• 0%
• 100%
• 75%

How many alleles (letters) do each person carry for a trait?

• 1
• 2
• 3
• 4