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WorksheetsMendelian Genetics
Total questions: 25
Worksheet time: 13mins
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 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
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
Mendel's Law of Segregation is shown on the outside of a Punnett Square. According to this law, the genes from each parent _____ when gametes are formed.
combine as one
separate
mutliply
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)
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
If red eye color (R) in fruit flies is dominant to white eye color (r), predict the phenotype of an offspring which has a genotype of rr.
Red Eye
White Eye
Homozygous recessive white-eyed fly
Homozygous dominant white-eyed fly
Which of the following is true about the law of segregation?
It happens during mitosis
It happens during gamete formation or meiosis
It states that during interphase, the pair of genes separates into daughter cells
None of the choices
A particular genetic cross in which the individual in question is crossed with an individual known to be homozygous for a recessive trait is referred to as a:
parental cross
dihybrid cross
filial generation mating
reciprocal cross
test cross
A dihybrid cross:
results in a genotypic ratio of 2:1
involves genes located on the sex chromosomes
results in offspring of lower quality than that of the parents
results in two different phenotypes in the F2 generation
is a cross between identical double heterozygotes
It has been found that at a certain locus of the human genome, 200 different alleles exist in the population. What is the most number of these alleles each individual may have?
1
2
100
200
400
Gregor Mendel’s Law of Independent Assortment posits that:
the fate of different chromosomes during gamete formation is independent of each other
different genes are located on different chromosomes
all offspring are different from their parents
no gametes are heterozygous for any particular gene
All of the above
A feature regulated by a set of genes (allele) passed on
from parents to offspring. Also called inherited traits.
Heterozygous
Mendel
Chromosome
Traits
