Hybrid individuals are also referred to as being individuals that are ...
heterozygous..
mutant..
homozygous..
recessive..
Question 1
In humans, the child’s sex is normally determined by the ...
father’s gamete.
mother’s gamete.
Question 2
XX chromosomes of the mother.
segregation of alleles during meiosis.
A zygote with XX gonosomes ...
Question 3
will give rise to a female child.
will give rise to a male child.
is triploid.
is haploid.
Sex-linked characteristics are possible in humans because, for most genes on the X chromosome, the Y or male chromosome usually has ...
Question 4
no alleles.
dominant alleles.
both alleles.
recessive alleles.
In pea plants the allele for flower colour (C) is dominant to the allele for lack of flower colour (c). A plant homozygous for flower colour was crossed with a plant bearing colourless flowers. The F1 plants were then self-pollinated. Which of the following correctly represents the ratio of genotypes expected in the F2 generation?
Question 5
1CC:2Cc:1cc
All Cc
1CC:1Cc
3CC:1cc
Which scientist is known as the father of genetics?
Question 6
Mendel
Watson
Darwin
Newton
When a brown guinea-pig was crossed with a white guinea-pig, all the offspring were brown. What conclusion can be drawn?
Question 7
The white guinea-pig is homozygous for white coat colour.
The characteristic white is dominant.
The brown guinea-pig is heterozygous for brown coat colour.
The characteristic brown is dominant.
A plant with red flowers is crossed with a plant with white flowers. The flowers of all the F1 plants are red. Which of the following represents the genotype of the parents? (R = red ; r = white)
Question 8
RR × rr
rr × Rr
Rr × rr
Rr × Rr
A homozygous brown mouse was crossed with a homozygous white mouse. All the offspring produced were heterozygous. Brown is dominant. The expected offspring will be ...
Question 9
all brown.
three-quarter white and one-quarter brown.
one half brown and the other half white.
three-quarter brown and one-quarter white.
A couple have two sons and one daughter. The probability of them having another daughter is ...
Question 10
50%
one third.
75%
25%
A cross between two heterozygous parents produces 300 offspring. How many of the offspring are homozygous for the dominant gene?
Question 11
75
225
150
100
When the allele is different on both homologous chromosomes, the organism is ...
Question 12
a heterozygote.
homozygous.
hermaphrodite.
recessive.
The probability that two parents who are heterozygous for an inherited trait will have a homozygous dominant offspring is ...
Question 13
1 in 4.
1 in 3.
1 in 2.
1 in 1.
The alternative forms of a gene found on corresponding positions of homologous chromosomes is known as a/an ...
Question 14
locus.
allele.
homozygote.
heterozygote.
The seeds produced when heterozygous pea plants are cross-pollinated will yield plants with a genotypic ratio of ...
Question 15
1 : 2 : 1.
1 : 2 : 2 : 1.
3 : 1.
9 : 3 : 3 : 1.
When two animals mate, both of which are heterozygous for a particular characteristic, what would be the expected phenotypic ratio of the offspring?
Question 16
3 : 1
1 : 1
9 : 3 : 3 : 1
1 : 2 : 2 : 1
Which of the following will give a 1 : 1 phenotypic ratio in the F1 generation?
Question 17
Gg x gg
Gg x Gg
gg x gg
GG x gg
In humans, brown eyes are dominant and blue eyes are recessive. What is the probability that the eyes of the children of parents with heterozygous brown eyes, will be blue?
Question 18
25%
75%
50%
0%
In a cross between two heterozygous plants for red flowers, 160 offspring are produced. How many of these plants would be homozygous for red flowers?
Question 19
40
80
60
20
A homozygous white guinea-pig crossed with a homozygous black guinea-pig produced offspring that were all grey. What percentage of the F2 generation will be grey if two grey guinea-pigs were mated?
You must scroll to the top and examine your incorrect choices, with the view to improving your understanding of this topic. Refer to the Study Guide if necessary.
