19.)Meiosis results in the direct production of______________.
A.)Homozygous cells
B.)Heterozygous cells
C.)Gametes
D.)Zygotes
20.)
Which of the following best describes the shape of a DNA molecule?
A.)twisted ladder
B.)slinky
C.)comb
D.)rod
21.)
The complimentary way DNA’s nitrogen bases bond together allow the molecule to make an identical copy. If a mistake is made in the replication of DNA, it is called a _______________.
A.)replication error
B.)mutation
C.)trisomy
D.)chromosomal defect
22.)
Downs Syndrome is a genetic disorder characterized by _________________.
A.)all body cells having an extra chromosome
B.)all body cells missing a chromosome
C.)all sex cells having an extra chromosome
D.)all sex cells missing a chromosome
23.) Freckles are a dominant characteristic. The appearance of freckles is the phenotype. Which of the following represents a heterozygous genotype for freckles?
A.)FF
B.)Ff
C.) ff
2007-01-12 07:48:12 · 8 answers · asked by Anonymous in Education & Reference ➔ Homework Help
19. a or b
20. a
21. b
22. ?
23. b
2007-01-12 07:55:34 · answer #1 · answered by puma 6 · 0⤊ 0⤋
19 C
20 A (actually, none of the above in eukaryotes)
21 B
22 A (usually. Sometimes it's just an extra piece of chromosome 21 that got stuck on one of the others)
23 B
2007-01-12 19:41:32 · answer #2 · answered by Anonymous · 0⤊ 0⤋
20. A
2007-01-12 15:53:29 · answer #3 · answered by EnCryPter 2 · 0⤊ 0⤋
Absolutely agree with ROSE - C A B A B
2007-01-12 16:16:17 · answer #4 · answered by ecolink 7 · 0⤊ 0⤋
19. c
20.a
21.?
22.?
23.b
2007-01-12 23:27:10 · answer #5 · answered by rebeandphantom 5 · 0⤊ 0⤋
sorry dont know any but i did know # 20 A
2007-01-12 15:56:50 · answer #6 · answered by ausi 2 · 0⤊ 0⤋
yes rose2003 is correct
2007-01-12 17:35:23 · answer #7 · answered by ♥cняiѕтїŋα♥ 1 · 0⤊ 0⤋
19:C
20:A
21:B
22:A
23:B
2007-01-12 16:01:38 · answer #8 · answered by ROSE2003 2 · 1⤊ 0⤋