Microsoft Word libs task oosci 11 5090 12 2022

B 
large 
millions 
cannot move on their own 
C 
small 
normally one 
can swim 
D 
small 
millions 
can swim 
36
During the menstrual cycle, hormone M is released in the body to stimulate the production of 
eggs. This is then followed by the release of hormone N which brings about ovulation. 
What are the names of hormones M and N? 
hormone M 
hormone N 
A 
oestrogen 
FSH 
B 
LH 
oestrogen 
C 
FSH 
LH 
D 
progesterone 
oestrogen 

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17
© UCLES 2022 
5090/12/O/N/22 
37
What is the correct order for the sizes of the pieces of genetic material shown in the table, from 
smallest to largest? 
smallest 
largest 
A 
gene 
molecule of DNA 
chromosome 
B 
molecule of DNA 
gene 
chromosome 
C 
chromosome 
molecule of DNA 
gene 
D 
gene 
chromosome 
molecule of DNA 
38
A man of blood group A and his wife of blood group O had two children, both of blood group A. 
The man concluded that he must be homozygous for the allele 
I
A
, since he thought half his 
children would be of group O if he were heterozygous. 
Why was his conclusion unsound? 
A
Blood group mutations are common. 
B
Genetic ratios are unreliable for small numbers. 
C
His wife might have been heterozygous. 
D
The expected ratio for a heterozygous father and group O mother is 3 group A
:
1 group O. 
39
Rising carbon dioxide levels in the atmosphere are causing the Earth’s climate to warm up. 
In what way might this change of climate affect the process of natural selection?