Learning Guide 3 Quiz

Which combination of sex chromosomes determines the sex of an individual?

XX: female and YY: male

YZ: female and YY: male

XX : female and XY: male

YY: female and YZ: male

If the parents of three boys in their family become pregnant, the chance of the next baby being a girl is……………….

Cannot be determined

50%

100%

Every organism has two alleles for every trait because ………..

There are two parents

There are two types of genes

The four bases combine in pairs

Genes work in pairs

The dominant allele is the one that…

Will mix with the other allele to give a new characteristic

Will be carried by the ovum

Will always show up in the phenotype

Will be inherited by the male

If the (B) allele codes for brown eyes and (b) for blue eyes, what are the possible genotypes?

B and b

BB and bb

BB, Bb, and bb

Brown eyes and blue eyes

The genotype of a blue-eyed person must be ………………

BB or Bb

Use a Punnett Square to work out the percentage of blue-eyed children from parents that are Bb and bb. …………………………

100%

25%

50%

"Homozygous” means ......

Both sex chromosomes in the genotype are different

Both sex chromosomes in the genotype are the same

Both alleles in the genotype are the same

Both alleles in the genotype are different

A ‘pedigree chart’ is like a…….

Family tree

DNA molecule

Genotype

Punnett Square

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