The backbone chains of a DNA molecule are made of which chemicals?
Sugar and protein
Sugar and phosphate
Phosphate and protein
The nitrogenous base cytosine only pairs with which other base?
Adenine
Thymine
Guanine
What type of code is the DNA code?
Double code
Triplet code
Quadruple code
What are the different versions of a gene called?
Chromosomes
Bases
Alleles
What term could be used to describe the pair of alleles HH?
Homozygous dominant
Heterozygous
Homozygous recessive
What is the definition of a dominant allele?
The strongest allele
The allele that will be expressed in the heterozygote
The weakest allele
Which of these is a phenotype?
Bb
Blonde hair
Tattoos
If the parental genotypes are heterozygous, what percentage of the offspring will be homozygous recessive?
25%
50%
75%
If the parental genotypes are heterozygous, what percentage of the offspring will show the dominant phenotype?
If the parental genotypes are heterozygous, what ratio will be shown in the genotypes of the offspring?
1:2:1
3:1
1:1