Year 10 Bio Test

Question 1

Dna looks “like a twisted ladder’ if the “rungs of the ladder are nitrogen bases (Cs Ts Gs and As) what would the sides of the ladder be made up of?

Answer 1

Sugars and phosphates

Question 2

DNA replication and growth occur during…

Answer 2

Interphase

Question 3

A shaded square on a pedigree represents a…

Answer 3

An Affected Male

Question 4

If someone has the genotype tt for a particular characteristic they are said to be…

Answer 4

Homozygous

Question 5

The correct order for phases of mitosis is…

Answer 5

C B D A

Question 6

The following sequence of bases - GGGATTAC- which is the complementary strand of DNA?

Answer 6

CCCTAATG

Question 7

An adult male mouse has 40 chromosomes in each of its liver cells. How many chromosomes will it have in each of its sperm cells?

Answer 7

20

Question 8

DNA replication is shown below. Which statement about DNA replication is NOT true?

Answer 8

helicase winds up the DNA strands, joining the hydrogen bonds between strands.

Question 9

Define Allele

Answer 9

One of two or more versions of a genetic sequence at a particular region on a chromosome

Question 10

Define Phenotype

Answer 10

a visible trait

Question 11

NUMBER 10 ON THE IMAGE

Answer 11

T and A together

Question 12

Shown is a cell undergoing mitosis, State the phase of mitosis shown

Answer 12

Metaphase

Question 13

Label 1 component visible in the cell

Answer 13

spindle fibres ( the lines in it)

Question 14

Most cells undergo mitosis, list 2 reasons why mitosis is necessary

Answer 14

To grow new cells and replace old and damaged ones

Question 15

Image A and image B show telophase 1 and telophase 2
State which image is telophase 1 or 2

Answer 15

Image A = telophase 2. Image B = telophase 1

Question 16

Name one cell type where meiosis occurs

Answer 16

germ cells

Question 17

Compare and contrast mitosis and meiosis, give one example of a similarity and difference

Answer 17

SAME = produce new cells DIFFERENCE= meiosis purpose is sexual reproduction, mitosis purpose is cellular proliferation

Question 18

What is the relationship between individual 3 and 4

Answer 18

Brother and sister

Question 19

What is the percentage chance that individual 5 is a carrier of the disease

Answer 19

75%

Question 20

Would the allele for the tay sachs disease be dominant or recessive, justify your answer

Answer 20

It would be recessive as only 1 of four siblings has it and the other three siblings all have the same dominant trait.

Question 21

When a white flower is crossed with a red flower the resulting flower is neither red or white, the pattern appears to be pink.

What is the name of this type of inheritance

Answer 21

incomplete dominance