Genetics22

Look at this cross: X^B X^B x X^b Y

What proportion/percent of the male children are colorblind?

• 100%

• 75%

• 25%

• 0%

H= normal blood clotting

h=hemophilia

X^HX^h x X^HY

What is the probability that any of their offspring will have hemophilia?

• 4/4

• 3/4

• 2/4

• 1/4

The sex of a child is determined by

• whether the father's sperm contains an x or y chromosome
• whether the mother's egg contains an x or y chromosome
• the age of the parents

The visual representation of an individual's chromosomes is a 

• phenotype
• genotype
• karyotype
• stereotype

Why is the gene for a disease or disorder more likely to be found on the X chromosome than Y?

• The X chromosome has many more genes
• The Y chromosome has many more genes

Males can be heterozygous for sex-linked traits.

• True

• False

What would the genotype be of a colorblind male?

• X^NY

• X^NYⁿ

• XⁿY

• XⁿYⁿ

Which of the following genotypes belongs in the red box in the Punnett square?

• X^BX^B
• X^bX^b
• X^bY
• X^BY

Based on the following Punnett square, what percentage of the offspring will have this recessive disease?

• 0%
• 25%
• 50%
• 75%

Which of the following is a result of a nondisjunction?

• Klinefleter syndrome

• Sickle cell anemia

• Albinism

• Hemophilia