Inheritance - Sex-linked traits

This kind of image is called a ...

• chromosome map

• karyotype

• autosome image

• chromosome cross

The individual represented here is ...

• a male

• a female

Suppose a person is a carrier for a genetic disorder. Which of the following phrases about this person is true?

• will develop the disorder only late in life

• does not have the disorder but can pass it on

• cannot pass the disorder to sons, just daughters

• the allele is not passed on due to Y chromosome inactivation

A couple have two sons. What are the odds their next child is a girl?

• 0

• 1/8

• 1/4

• 1/2

• 3/4

Hemophilia is a recessive sex-linked trait. If H = normal & h = has hemophilia, which genotype represents a male with hemophilia. 

• X^HY
• X^HX^h
• X^hX^h
• X^hY 

What term denotes the physical expression of a gene?

• genotype

• phenotype

• appearance

• homologous

Which term denotes the combination of genes an organism has?

• genotpye

• phenotype

• heterozygous

• homozygous

What percentage of the offspring will have this recessive disease?

• 0%
• 25%
• 50%
• 75%

What percentage of the female offspring will be a carrier for this recessive disease?

• 0%
• 50%
• 100%
• 25%

How many PAIRS of chromosomes do humans have?

• 23
• 46
• 1
• 2