Biology questions??

9. In humans the allele for free earlobes is dominant to the allele for attached earlobes. The allele for dark hair is dominant to the allele for light hair. Let "E" represent free earlobes and "D" represent dark hair. What is the phenotypic ratio in the offspring resulting from the following cross: EeDd x EeDd?

A. 9 free earlobes and dark hair: 3 free earlobes and light hair: 3 attached earlobes and dark hair: 1 attached earlobes and light hair

B. 4 free earlobes and dark hair: 4 free earlobes and light hair: 4 attached earlobes and dark hair: 4 attached earlobes and light hair

C. 8 free earlobes and dark hair: 8 free earlobes and light hair

D. 5 free earlobes and dark hair: 3 free earlobes and light hair: 2 attached earlobes and dark hair: 1 attached earlobes and light hair

10. Two of the F1 offspring resulting from problem nine were crossed. Their F2 generation consisted of the following phenotypic ratio: 9:3:3:1. What where the genotypes of the cross between the F1 offspring?

A. eeDD x eeDD

B. EEdd x EEdd

C. eeDd x Eedd

D. EeDd x EeDd

11. Eukaryotic organisms, such as humans, contain chromosomes that __________.

A. have genetic information from both parents

B. are made of DNA

C. become visible under a high-power microscope during prophase

D. all of the above

12. When mitosis is complete, the two new cells that are formed __________.

A. are genetically identical to each other

B. are haploid, unlike the starting cell

C. are genetically different from each other

D. are sperm in males or eggs in females

13. A chromosome is made up of two __________.

A. gametes

B. spindle fibers

C. chromatids

D. karyotypes

14. Cells that are the product of meiosis __________.

A. have the same number of chromosomes as the original diploid cell

B. have half the number of chromosomes as the original diploid cell

C. are identical to one another

D. are mutations

15. The sex of offspring produced by humans is determined by the __________.

A. diet of the mother

B. male

C. female

D. none of the above

16. During interphase, right before a cell starts mitosis, the cell __________.

A. duplicates its chromosomes

B. makes a new cell membranes for each new daughter cell

C. undergoes cytokinesis

D. none of the above

17. A human with both X and Y chromosomes __________.

A. is a male

B. makes gametes that can produce either male or female offspring

C. has crossing-over occur during meiosis

D. all of the above

18. The term gamete is used to describe haploid reproductive cells, including __________.

A. sperm

B. eggs

C. both sperm and eggs

D. none of the above

19. Body cells that are (2n) are called __________.

A. haploid

B. diploid

C. sperm

D. eggs

20. __________ is also called reduction division.

A. Mitosis

B. Meiosis

C. Crossing-over

D. Cytokinesis

Biology questions??

i hate tutorial questions!

9. A

10. D

11. C

12. A

13. C

14. B

15. B

16. A

17. D

18. C

19. B

20. B