8 - DNA + Meiosis

Question 0

Double helix

Answer 0

Structural backbone to DNA molecule

Question 1

characteristic of a nucleotide

Answer 1

Deoxyribose
Organic base (C+T or A+G)
Phosphate group
{JOINED BY CONDENSATION RCTN}

Question 2

Functions of DNA

Answer 2

Contains genetic info
Tightly coiled for large s•a
Strands joined by hydrogen bonds = easy to replicate
Double helix = stable to pass down generations

Question 3

Features of triplet code

Answer 3

Punctuated
Linear
Almost universal
Non overlapping
Triplet
Degenerate

Question 4

Diploid chromosomes

Answer 4

46 chromosomes 
Body cells (Somatic)

Question 5

Haploid cells

Answer 5

23 chromosomes 
Sex cells (gametes)

Question 6

What is an allele?

Answer 6

Alternative forms of gene

Different base sequence of a gene

Question 7

What happens in meiosis 1

Answer 7

Homologous pair up + chromatids wrap around each other

Question 8

What happens in independent segregation

Answer 8

Random way homologous chromosomes line up during meiosis 1 and then divide into daughter cells

Question 9

What happens in meiosis 2

Answer 9

Chromatids move apart

Four daughter cells are formed

Question 10

Key features of meiosis

Answer 10

Homologous chromosomes pair up
Crossing over
Chromosomes come apart from centrometer forming 4 daughter cells