1) How many chromosomes are shown in a normal human karyotype?

Question

A) 2
B) 23 *
C) 44
D) 46

2) In some chickens, feather color is controlled by incomplete dominance. When a black chicken mates with a white chicken, all the offspring are covered in grey feathers. A farmer mates a black chicken (BB) with a grey chicken (BW) . What are the predicted phenotypes of their offspring?

A) 100% white
B) 75% black, 25% white *
C) 50% black, 50% grey
D) 100% grey

3) When cattle with solid white coats (W) are mated to cattle with solid red coats (R), the offspring are roan (WR) meaning they have coats containing both white and red hairs. The roan coat is an example of codominance.

A farmer mates two roan cattle. What is the chance that their offspring will be white?

A) 100%
B) 75%
C) 50% *
D) 25%
E) 0%

4) Blood typing is an example of _ . This is where there is one gene, but that one gene can have more than two versions.

A) homozygous dominance *
B) dihybrid trait
C) multiple alleles
D) incomplete dominance

5) This human karyotype is unusual because chromosome set

A) 10 is missing genetic material
B) 14 has enlarged chromosomes
C) 21 has an extra chromosome **
D) 5 has chromosomes of different shapes