C - Level
1. C. AABbcc will look the same as AaBBcc
2. Meiosis - makes sex cells, 4 genetically different cells; Mitosis – makes every other cell, 2 genetically identical cells
3. Tt x Tt = 75% will look like T, 25% will look like t
4. Incomplete Dominance (3rd phenotype appears)
5. XHXh with XHY
a. Daughters with hemophilia – 0%
b. Sons with hemophilia – 50%
6. Two organisms may share the same phenotype, but have differing genotype.
7. Bb x Bb (75% Black, 25% Brown fur)
8. To make genetically different cells
9. Sex cells are also known as gametes. Since they only have 1 set of chromosomes, they are called haploid. Cells with 2 sets of chromosomes are called diploid.
10. 2 brothers!
B – Level
1. Incomplete dominance
a. RR – red, rr – white, Rr – pink.
b. rr x Rr = 50% white, 50% pink
2. Key: BB – blue, bb – white, Bb – blue AND white. Bb x Bb = 25% Blue, 25% white, 50% blue and white.
3. ii x IAIB = 50% Type A, 50% Type B
4. (check with Mrs. Sohn in class)
5. XBXB with XbY
a. 0% sons will be colorblind
b. 0% of daughters will be colorblind
6. Key: D – Dark, d – blonde
a. Dd
b. dd
c. 50%
A – Level
1. Dihybrid Cross
a. BbEe
b. bbee
c. ¼
d. ¼
2. Males are more likely to inherit sex-linked traits because they only have one X. If there is something wrong with that X, they will always show the trait. They do not have another X to “make up” for that other X.
3. ii x ii; IAi x IAi, IBi x IBi
