WorksheetsDominant and Recessive Genes
Total questions: 20
Worksheet time: 10mins
How many alleles do you inherit from EACH parent for a specific trait?
1
2
A tool used to predict the probability of offspring inheriting certain traits is called a ...
karyotype
Punnett Square
The study of heredity is called ....
biology
genetics
chemistry
The physical expression of a trait is called the ...
genotype
phenotype
Segments of DNA that code for traits are called ....
genes
proteins
alleles
Genotype: TT
homozygous dominant
homozygous recessive
heterozygous dominant
Genotype: Aa
homozygous dominant
homozygous recessive
heterozygous dominant
Cross 2 heterozygous tall pea plants. Tall (T) is dominant to short (t). What fraction of the offspring do you predict will be tall?
1/4
2/4
3/4
4/4
Which statement below describes DOMINANT alleles?
expressed when at least one is present
only expressed when 2 are present
Which of the following is a PHENOTYPE for flower color in pea plants?
Pp
PP
Purple
The trait or allele that is expressed when only one is present is called the ___________ trait.
dominant
recessive
In pea plants, tall (T) is dominant over short (t). If two heterozygous tall pea plants are mated, what is the the expected genotypic ratio of their offspring?
3 tall : 1 short
1 TT : 2 Tt : 1 tt
In the problem shown, what must the genotype of the missing parent be?
BB
Bb
bb
The different forms or versions of a gene are called ...
alleles
gametes
In humans, freckles (F) on the skin are dominant to no freckles (f). If a heterozygous parent and a recessive parent conceive, what is the chances of having a child with NO FRECKLES?
0%
50%
100%
Having freckles is a dominant trait in humans. A girl has freckles, but her brother does not. What do we know for certain about the parents?
both parents have at least one recessive allele
both parents are heterozygous for freckles
one of the parents does not have freckles
In a population of bees, long wings (L) are dominant over short wings (l). Bees with long wings are ...
heterozygous only (Ll)
homozygous
dominant only (LL)
heterozygous or
homozygous
dominant (LL or Ll)
In guinea pigs, the allele for rough coat (R) is dominant over the allele for smooth coat (r). A homozygous dominant guinea pig and a homozygous recessive guinea pig are mated.
What would be the phenotype of the offspring?
100% rough coat
100% smooth coat
Genotype: rr
homozygous dominant
homozygous recessive
heterozygous dominant
Which statement below describes RECESSIVE alleles?
expressed when at least one is present
only expressed when 2 are present
