Biology 6.1.2

Question 1

Cells in Reproductive Organs Divide by ___ to Form ___.

Answer 1

Meiosis, Gametes.

Question 2

What must happen to the number of Chromosomes when the Gametes are Formed? Why?

Answer 2

They must Half to 23 each. So then when Sperm Cell & Egg Cell join, there are 46 total Chromosomes.

Question 3

During Meiosis, the number of Chromosomes Halves. This is known as ___ Division.

Answer 3

Reduction.

Question 4

What is ‘Reduction Division’?

Answer 4

EG in Meiosis, when the number of Chromosomes Halves from 46 to 23. From Diploid to Haploid.

Question 5

What are ‘Diploids’?

Answer 5

Cells with the full 46 Chromosomes, eg regular Body Cells.

Question 6

What are ‘Haploids’?

Answer 6

Cells with 23 Chromosomes, eg Gametes.

Question 7

Explain the Meiosis of Gametes: (5)

Answer 7

-23 Maternal & 23 Paternal Chromosomes enclosed in Nucleus. 46 Chromosomes in total.

-Each Chromosome Duplicates. 92 Chromosomes in total. First Division.

-Nuclear Membrane Breaks Down. M+P Chromosomes Pair Up along the Centre of the Cell. Second Division.

-Sections of DNA are Swapped between M+P Chromosome Pairs, Creating Recombinant Chromosomes.

-Four Haploid Daughter Cells Produced.

Question 8

When Sperm Cells join Egg Cells, there is now a total of ___ Chromosomes.

Answer 8

46.