BIOLOGY - Inheritance, variation , evolution

Question 1

what is sexual reproduction

Answer 1

where a male gamete meets a female gamete. This fusion of the two gametes is called fertilisation.

Question 2

Gamets are produced by ……. in the sex organs

Answer 2

Meiosis

Question 3

What is asexual reproduction

Answer 3

does not require different male and female cells . genetically identical clones are produced from mitosis.

Question 4

The nucleus of each cell contains a complete set of genetic instruction called the ……

Answer 4

Genetic code

Question 5

DNA is made from two strands coiled around each other called ….

Answer 5

Double helix

Question 6

What is a genome

Answer 6

a genome of an organism is the entire genetic material present in an adult cell of an organism

Question 7

All Alleles are described as ….. and …..

Answer 7

Dominant
Recessive

Question 8

A DOMINANT Allele controls the …

Answer 8

development of a charcteristic - even if it is only present on one of the chromosomes

Question 9

A RECESSIVE Allele control the

Answer 9

Development of characteristics ONLY if a dominant allele is not present. ( If recessive allele is present on both chromosomes in a pair)

Question 10

If both chromosomes in a pair contain the …… Allele of a gene , it is described as being a …… for that gene or condition

Answer 10

1. Same
2. Homozygeous

Question 11

If the chromosomes in a pair contain …… alleles of a gene, the individual is …… for that gene or condition.

Answer 11

1. different
2. heterozygus

Question 12

The combination of alleles for a particular characteristics is called the

Answer 12

genotype

Question 13

Variation is …he two majo factors that contribute to the apparece and function of a organism are :

Answer 13

Genetic infomation

enviroment infomation

Question 14

What does genetic information mean …

Answer 14

passed on from parents to off spring

Question 15

what does environment information mean …

Answer 15

the conditions that affect that organisms during its lifetime e.g : climate / diet

Question 16

How are fossils formed 5 MARKS

Answer 16

1. process of decay usually causes the tissue to breakdown.
2. over thousands of years , more sediment rocks are layered on top - compressing the remains
3. bones and teeth are replaced by minerals from solutions in the rocks
4. tectonic plate movement brings sediment containing fossils nearer the surface
5. erosion of the rock by wind , rain , rivers expose the fossil.