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WorksheetsGenetics 4.1 tutorial
Total questions: 8
Worksheet time: 4mins
In a monohybrid cross between two heterozygous plants (Pp × Pp), what is the expected phenotypic ratio of the F2 generation?
1:2:1
2:1
3:1
1:1
Which of the following genotypic ratios is expected in the F2 generation of a monohybrid cross (Pp × Pp)?
3 PP : 1 pp
1 PP : 2 Pp : 1 pp
1 Pp : 3 pp
2 PP : 2 pp
A test cross between a plant with purple flowers (dominant phenotype) and a white-flowered plant yields 1 purple : 1 white. What is the genotype of the purple-flowered parent?
PP
Pp
pp
Cannot be determined
In a dihybrid cross (YyRr × YyRr), how many different phenotypes are expected in the F2 generation?
2
4
8
16
What is the phenotypic ratio expected from a dihybrid F1 self-cross (YyRr × YyRr)?
3:1
1:2:1
9:3:3:1
1:1:1:1
A dihybrid test cross (YyRr × yyrr) results in which phenotypic ratio in the offspring?
3:1
1:2:1
1:1:1:1
9:3:3:1
In a dihybrid cross between yellow round (YyRr) and green wrinkled (yyrr), which genotype combination will produce green wrinkled offspring?
YyRr
Yyrr
yyRr
yyrr
Which statement correctly explains the use of a test cross?
To calculate mutation frequency
To determine whether an organism is homozygous or heterozygous dominant
To determine chromosome number
To promote variation
