I need help with questions 20-24 please.

20:Yes,individual #1 is XBXb,as the mother passes on the recessive Xb to her sons. The son individual #2 in generation 2 is affected by the recessive gene which he can only inherit from his mother.

21:mother

22:Sex-linked are Gene's carried on the sex Gene's chromosomal pair 23 whereas autosomal can be carried by any of the other 22 chromosomal pairs.

23:one

24:Yes

100% shaded,all 3 individuals

Homozygous dominant(HH) crossed with homozygous recessive (hh) yields a probability of 100% Hh.

events in order:

1.       vishnu schist

2. zoroaster granite

3. bass limestone

4. hakatar   shale

5. igneous intrusion

6. shinumo quartzite

7. dox sandstone

8. tapeats limestone

9. bright angel shale

10. muav limestone

11. temple butte limestone

12. redwall limestone  

nonconformity

answer: the unkar group shows angular unconformity because the layers are turned at angle.

unconformity

answer: specifically the angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled. an angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled.

disconformity

answer: the disconformities aremarked irregular lines between the sedimentaryrocks layers.