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WorksheetsGenetic Inheritance
Total questions: 15
Worksheet time: 30mins
The set of alleles for a trait of an organism is known as
homozygous
heterozygous
phenotype
genotype
Mendel’s principle of segregation states that:
alleles from one parent mask the expression of allele from the other parent
alleles separate from each other before forming gametes
hybrids will express a phenotype intermediate between the two parental phenotypes
true-breeding parents produce offspring of the same phenotype
Two Martians fall in love and marry. One Martian is homozygous for red eyes and the other is heterozygous. The recessive eye color is purple. What are the chances that the alien couple will have a child with red eyes?
100%
50%
75%
25%
Alleles segregate independently of other alleles because…………………
maternal and paternal chromosomes line up randomly on either side of the equator during metaphase I
separation of sister chromatids during anaphase I
homologous chromosomes moves to the opposite poles of the cell
crossing over during prophase I
If gene A and gene B are located in a different chromosome, which of the following crossing will produce the progeny with genotype AaBb?
I. Aabb X aaBb
II. AaBB X Aabb
III. aaBB XAABb
IV. Aabb X AaBb
I, II and III
I, II, III and IV
B. I, II and IV
I, III and IV
In aubergine plant, the gene for brown stem is dominant over its allele for green stem, and the gene for purple fruit is dominant over its allele for white fruit. If two aubergine plants which are heterozygous for both characteristics are crossed, what is the ratio of the expected progeny to have brown stem and white fruit?
1/16
4/16
3/16
6/16
Brown eye color is dominant. Blue eye color is recessive. Select the combination of letters below that would represent a person being a pure breed for brown eyes
AA
aA
aa
Aa
Which of the following represents the possible genotypes resulting from a cross between an individual heterozygous (Bb) and one that is homozygous recessive (bb)?
B. Bb and bb
BB and bb
Bb only
BB and Bb
How do you determine the genotype of a plant with a dominant trait?
Test cross with homozygous dominant
Test cross with heterozygous
Test cross with homozygous recessive
Back cross with its parent
The colour of snapdragon flower shows
dihybrid inheritance
incomplete dominant alleles inheritance
codominant alleles inheritance
monohybrid inheritance
A test cross has been carried out where F1 plants with phenotype red flowers (R) and long (L) seeds which is heterozygous are crossed with plants which are homozygous recessive for white flowers (r) and short seeds (l). This cross will produce F2 which different phenotype with each other. What is phenotype ratio of F2 obtained from the cross above?
1:1
1:1:1:1
9:3:3:1
1:2:1
In pea plants, spherical-shaped seeds are dominant over dented seeds. Pure breeding parents with spherical-shaped seed and dented seed are bred. What percentage of spherical-seeded plants in the F2 generation from the self cross between F1 hybrid pea plants?
30%
25%
75%
50%
If AaBb performs a testcross, what fraction of the offspring are expected to have only one dominant phenotype?
2/8
2/16
1/2
1/16
A cross between true breeding red snapdragon and white snapdragon produce F1 offspring. The self-cross between F1 offspring results in F2 generation where 50% of the snapdragons are pink in colour. Based on the statement given, determine which of the following is TRUE
50% of snapdragons in F2 generation is red in colour
The phenotypic ratio for F2 generation is 1:2:1
All snapdragons in F1 generation have the same phenotype as the homozygous parents
The offspring produced in F2 generation show either white or pink flower colour only
In a cross between two heterozygotes (Aa), the F1 generation will
All are heterozygous
Display in the ratio 1:1 homozygous to heterozygous
Display in the ratio 1:3 homozygous to heterozygous
Display in the ratio 1:3 heterozygous to homozygous
