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WorksheetsInheritance 1
Total questions: 18
Worksheet time: 23mins
What does genotype mean?
The visible characteristics in an organism, controlled by the genotype, e.g. a tall plant or a dwarf plant.
The genetic make-up of an organism, e.g. Tt, where T and t are alleles of a gene.
The characteristics visible in an organism, controlled by the genotype, e.g. a tall plant or a dwarf plant.
Phenotype
Genotype
Homozygous
Heterozygous
What is the genotype for a homozygous dominant offspring?
What percentage of the possible offspring will be hybrids (heterozygous)?
In budgies, green (G) is dominant to blue (g). A homozygous green budgie is mated with a heterozygous budgie. What is the genotype ratio of the offspring?
100% GG
50% GG
50% Gg
100% gg
75% Gg
25% GG
In a tomato plant, tall is dominant over short, and hairy stems is dominant over non-hairy stems. A pure breeding tall hairy stemmed plant is crossed with a short heterozygous hairy stem. What is the phenotype ratio of the offspring?
75% Tall non-hairy
25% Short hairy
50% Tall hairy
50% Short hairy
50% Tall non-hairy
50% Short non-hairy
100% Tall hairy
A red flower and white flower mate to form a pink flowered offspring. This is an example of
Dominant trait
Recessive trait
Codominance
Incomplete dominance
A woman with Type O blood and a man who is Type AB are expecting a child. What are the possible blood types of the child?
A
AB
B
O
A round pea (WW) crosses with a wrinkled pea (ww).
The phenotype of the F1 generation is:
100% round
100% wrinkled
50% round
50% wrinkled
75% round
25% wrinkled
Sex-linked inheritance refers to inheritance of traits located on the X and Y chromosome
True
False
Identify which type of sex-linked example this image represents.
X-linked dominant
X-linked recessive
Y-linked
sex-limited
Identify the features of Y-linked traits
Located on the X chromosome
Appears in all daughters of males who exhibit the trait
Only occur in males
Not passed to daughters
Appears in all sons of males who exhibit the trait
In guinea pigs, the smooth coat (S) is dominant over the rough coat (s). If an SS guinea pig is crossed with an ss guinea pig, what ratio of guinea pigs would you predict in the offspring?
All offspring will be Ss and have smooth coats.
75% will have smooth coats, and 25% will have rough coats.
All offspring will be Ss and have rough coats.
Half the offspring will be SS, and the other half will be ss.
In a dihybrid cross involving pea plants heterozygous for two traits (RrYy x RrYy), how many of the offspring will be phenotypically green? Round (R) is dominant over wrinkled (r), and Yellow (Y) is dominant over green (y).
12/16
9/16
4/16
3/16
If an individual has the dominant phenotype, is the genotype always known?
yes
no
