Help With Biology Packet?

Question

a)How many cells are produced during mitosis?
b)Why does a cell undergo mitosis?
c)As a cell grows, what sort of demands are placed on the cell?

2.In some plants, flower color displays incomplete dominance. A red petunia when crossed with a white petunia produces pink flowers.
a)What alleles for color must a red plant have?
b)What alleles for color must a white plant have?
c) A pink plant must have what color alleles?
d)What plant(s) are homozygous for flower color?
e)What plant(s) are heterozygous for flower color?

3. A brown horse is mated with a white mare producing a white colt with large brown spots. What type of dominance is this and why?

Answer 1

1a. -2
b.- theories: Ratio of nuclear material to cytoplasmic material
gets too large.
Ratio of cell surface area to volume gets too large.
c- Must maintain ability to absorb necessary substances and sufficiently eliminate wastes.

2. Typical "Incomplete dominance", "blended inheritance" or "blending" questions: USE ALL CAPITAL LETTERS!
2a - RR
b- WW
c-RW
d-Red & White
e.- Pink

3- Could be "co-dominance", since both alleles are being expressed.

Answer 2

a) After mitosis always 2 cells are produced from the original one. We say two daughter cells are formed.

b) Well a body needs to undergo mitosis for growth and repair. Simply to replace or compensate degenerated cells. Also when a zygote( a cell formed after fertilization), it needs to undergo mitosis to produce an organism.

C) Well as the cell grows it must have the same genetic material as the original cell. This cell then needs to undergo metabolic reactions to produce energy and products that our body needs for living.

2.) a) Rr
b) Ww
c) RW
d) The pink flower plant
e) It could be any- white flower plant or the red flower plant

3.) This will be an example of co-dominance. In this it doesn't matter whether the alleles in the homologous chromosomes are dominant or recessive. If the homologous chromosome consists of two alleles that can produce proteins, then both will be produced and forms a different phenotype or characteristics to that of a homozygote.


hope they are all right :)

Answer 3

a)from one cell, 2 cells are produced.
b)for growth,reparation and ...
c) depends on the sort of cell,for example muscle cells need more oxygen as they grow
2-a)two similar alleles for example RR
b)two similar alleles :rr
c)Rr
d)red and white
e)pink
3-both alleles appear together.like A & B alleles in blood group

Answer 4

oh dear such old stuff
a)4 TAMP spelt backwards is how i remembered it
b)to make new cells
c)genes

a) dominant genes
b) recessive genes
c)white and red
d)red or white
e)pink

3. brown is a dominant gene so this creates spots in the horse because dominant genes always show