Biology · Oct / Nov 2021 · Paper 42 · Question 2

(thread-like structure) made / length / strand / composed / molecule, of DNA ;

carries / contains, genes / alleles / genetic information or material ;

prevent pollination (from another flower or plant) / to prevent (other) pollen landing on stigma ;

any two from:

reference to meiosis ;

gametes contain different alleles ;

idea of new / different, combinations of, maternal and paternal

chromosomes / alleles ;

idea of random fertilisation / fusion of gametes with different, genotypes or alleles ;

AVP ;

either:

1

meiosis halves the number of chromosomes

or

gametes are haploid

or

gametes, have one of each type of chromosome / have one set of chromosomes ;

and

2

idea that parental / diploid, number is restored at fertilisation

or

cells have 23 chromosomes and fuse together form a cell with 23 pairs ;

PRPR ;

PRPW ;

PRPR, PRPW, PWPW ;

codominance ;