Biology Unit 10 Practice 2019 Meiosis and Punnet Squares

What would the genotype be for a heterozygous red and tall organisms be?
T=Tall
t=Short
R=Red
r=Black

• TtRr
• TTRR
• TrRR
• Ttrr

What would the phenotype of a organism that has the following genotype?
Xxyy
X=Tall
x=Short
Y= Wrinkled
y = Smooth

• Short and Smooth
• Tall and Wrinkled
• Tall and Smooth
• Short and Wrinkled

This trait masks other trait; the trait that shows if present. Represented by capital letter.

• Dominant
• Recessive
• Genotype
• Phenotype

A plant species has two alleles for seed shape: Flat (F) and round (f). The Flat (F) allele exhibits incomplete dominance. The intermediate phenotype is curved seeds.
Based on the following Punnet Square, what is the probability that an offspring will have round seeds?

• 0%
• 100%
• 25%
• 50%

A plant species has two alleles for leaf shape: Curly (C) and flat (c). The Curly (C) allele exhibits complete dominance. Based on the following Punnet Square, what is the probability that an offspring will be heterozygous?

• 25%
• 50%
• 75%
• 100%

A plant species has two alleles for seed shape: Flat (F) and round (f). The Flat (F) allele exhibits incomplete dominance. The intermediate phenotype is curved seeds.
Based on the following Punnet Square, what is the probability that an offspring will be homozygous dominant?

• 0%
• 50%
• 75%
• 100%

How many phenotypes are there in a gene that contains two different alleles that show incomplete dominance?

• 1
• 2
• 3
• 4

In guinea pigs, the allele for black fur (B) is dominant over that for brown fur (b). Similarly, the allele for short fur (S) is dominant over that for long fur (s). The Punnett square below shows a cross between two guinea pigs with the genotype ‘BbSs’.

What is the phenotypic outcome of the offspring produced by this cross?

• 4 Black short fur, 4 Black long fur, 4 Brown short fur, 4 Brown long fur
• 13 Black short fur, 1 Black long fur, 1 Brown short fur, 1 Brown long fur
• 9 Black short fur, 3 Black long fur, 3 Brown short fur, 1 Brown long fur
• 12 Black short fur, 1 Black long fur, 1 Brown short fur, 2 Brown long fur

In pea plants, the allele for round seeds (R) is dominant over that for constricted seeds (r). Similarly, the allele for yellow seeds (Y) is dominant over that for green seeds (y). The incomplete Punnett square below shows a cross between two pea plants with the genotypes 'RrYy' and 'rryy' respectively.

What should be the genotype of the offspring in the two cells with a question mark?

• RrYy and rrYy
• Rryy and rryy
• RrYy and rryy
• Rryy and rrYy

A process in which homologous chromosomes will exchange genetic material with one another; results in genetic variability.

• Crossing Over
• Meiosis
• Homozygous
• Cytokenesis