Genetics

Question 1

Name the parts of the ANIMAL pollinated flower

Answer 1

A- anther
B- petals
C- style
D- nectary

Question 2

Name the parts of the WIND pollinated flower

Answer 2

E- stigma

F- filament

Question 3

Female part of the flower

Answer 3

Carpel

Question 4

Male part of the flower

Answer 4

Stamen

Question 5

Part of the flower that produces nectar

Answer 5

Nectaries

Question 6

Part of the flower that makes and stores pollen

Answer 6

Anther

Question 7

Part of the flower that protects the developing flower

Answer 7

Ovule

Question 8

Explain the relationship between a gene and allele

Answer 8

A gene is a section of a chromosome that codes for one characteristic and an allele is the different forms a gene can take.

Question 9

Explain the difference between a dominant and recessive allele.

Answer 9

A dominant allele is always expressed if present while a recessive allele is only expressed in the homozygous condition.

Question 10

State the cause of variation in snail shells. Explain how the brown snail population number increased and the lighter shell numbers decreased. Explain why variation in a species is important.

Answer 10

genetic variation etc

Question 11

Define the term gamete and state the names of human gametes. State how many chromosomes are in a human gamete. Explain how fertilisation occurs and why this process is important in terms a foetus getting a full set of DNA.

Answer 11

A gamete is a sex cell. The male sex cell is the sperm cell and the female human sex cell is the ovum (egg cell), and there is 23 chromosomes in each human gamete. The sperm cell fertilises with the egg cell in the fallopian tube and when the gametes join together, they form a cell called a zygote. Since human sex cells contain 23 chromosomes each, a zygote has 46 chromosomes. This process is important in terms of a foetus getting a full set of DNA as Haploid – having half the normal number of chromosomes
Diploid – having the normal number of chromosomes