Genetics Problems

Females-XX; MalesXY.  A couple has 4 girls.  What is the chance the next child will be a boy?

• 75%
• 100%
• 25%
• 50%

Tags

NGSS.HS-LS3-3

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

• Incomplete Dominance
• Co dominance
• Independent assortment
• Recessive inheritance

Snap dragon color is a incomplete dominant trait.  A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?

• Red
• Red and White
• White
• Pink

Tags

NGSS.HS-LS3-2

In guinea pigs, the alleles for black hair(B) is dominant to the allele for brown hair(b). Two black-haired guinea pigs are crossed. One of the pigs is homozygous for black hair and one is heterozygous. What percentage of their offspring are expected to have black hair?

• 25%
• 50%
• 75%
• 100%

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Suppose a father of blood type A and a mother of blood type B have a child of type O. What blood types are possible in their subsequent children?

• A,B,AB and O
• AB and O
• A and B
• O

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X ^R X ^r ?

• male with white eyes

• female with red eyes

• male with red eyes

• female with white eyes

Tags

NGSS.HS-LS3-1

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%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

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

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Why are men 16 times more likely to be color-blind than women?

• to be color-blind, you must have a Y chromosome
• males only have one copy of the gene
• color-blindness is caused by testosterone
• color-blindness is caused by the same gene as baldness

Tags

NGSS.HS-LS3-2

Colorblindness is a recessive x-linked trait.
Which genotype represents a male with normal vision?

• X^NX^N
• XY^N
• X^NY
• XⁿY

Tags

NGSS.HS-LS3-1