Microsoft Word libs task oosci 11 5090 12 2022


B  large  millions  cannot move on their own  C



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5090 w22 qp 12


large 
millions 
cannot move on their own 

small 
normally one 
can swim 

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 

oestrogen 
FSH 

LH 
oestrogen 

FSH 
LH 

progesterone 
oestrogen 


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 

gene 
molecule of DNA 
chromosome 

molecule of DNA 
gene 
chromosome 

chromosome 
molecule of DNA 
gene 

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? 

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