Which of these pairs are both gametes?
Sperm and ovum
Ovum and zygote
Zygote and sperm
Which definition best describes DNA?
A double helix made of bases
A monomer which carries the genetic code
A polymer made of nucleotides
Which pair of sex chromosomes shows a human female?
YY
XY
XX
How many chromosomes do gametes have?
Half the number that are in body cells
The same number as are in body cells
Twice the number that are in body cells
What is the difference between an allele and a gene?
A gene is one of two copies of an allele in a pair of chromosomes
An allele is one of two copies of a gene in a pair of chromosomes
Allele and gene are two names for the same thing
In the genetic cross Ee × Ee, what percentage of offspring are carriers?
25%
50%
75%
How many chromosomes do humans have?
2
23
46
When did Mendel publish his ideas on inheritance in plants?
Before Charles Darwin published On the Origin of Species
The same year that Charles Darwin published On the Origin of Species
After Charles Darwin published On the Origin of Species
Why is a Punnett square useful?
It can predict the probabilities of each genotype in the offspring of a cross
It can show how a particular feature is passed down the generations
It shows information about phenotypes but not genotypes
What does homozygous mean?
The two alleles are different genetic variants
The two alleles are the same genetic variant
The two alleles are both dominant