13. Mendelian Genetics

Monohybrid Crosses

Monohybrid Cross

Monohybrid Crosses Example 1

Animation: Cross of One Character in "MendAliens"

Genotypic vs. Phenotypic Ratio

Monohybrid Cross Explained

DRAW IT A pea plant heterozygous for inflated pods (Ii) is crossed with a plant homozygous for constricted pods (ii). Draw a Punnett square for this cross to predict genotypic and phenotypic ratios. Assume that pollen comes from the ii plant.

Animation: Mendel's Cross of One Character: Flower Color

 three-quarters of the dominant phenotype and one-quarter of the recessive phenotype 

 No. The offspring of a homozygous dominant parent cannot have a recessive phenotype. 

 No. One of the parents has a recessive allele. 

No. This is true of the F2 generation of a dihybrid cross with two true-breeding individuals.

Draw the Punnett square.

If an organism that is homozygous dominant is crossed with a heterozygote for that trait, the offspring will be __________.

Animation: Simplified Crosses of One Character in Humans

Monohybrid Cross | Genetics

Which of the following is the genotypic ratio of offspring created from a cross of two heterozygous parents for a single gene?a) 2:2b) 3:1&nbsp;c) 1:2:1&nbsp;d) 1:3

No. This is possible but unlikely. If one parent has the genotype Tt and the other parent has the genotype tt, about half of the offspring will be tall.

 No. This would indicate that the tall parent was homozygous. 

 The ratio of tall offspring to short offspring is 3:1. 

 No. This would be the ratio if both parents were heterozygous. 

 There is not enough information to answer the question. 

 No. All of the necessary information is provided. 

 The ratio of tall offspring to short offspring is 1:1. 

This is a testcross.

Pea plants are tall if they have the genotype TT or Tt, and they are short if they have genotype tt. A tall plant is mated with a short plant. Which outcome below would indicate that the tall parent plant was heterozygous?

 No. The tall allele is completely dominant to the dwarf allele. 

No. All the F1 will have the same genotype and, therefore, the same phenotype.

 be three-quarters tall and one-quarter dwarf 

Try using a Punnett square.

Assume tall (T) is completely dominant to dwarf (t) in a certain species of plant. If a homozygous dominant individual is crossed with a homozygous dwarf, the offspring will __________.

Which of the following single gene crosses would always result in all offspring with the dominant phenotype?a) tt x tt.&nbsp;b) Tt x Tt.&nbsp;c) TT x tt.&nbsp;d) Tt x tt.

In a single gene cross between a homozygous dominant parent and a homozygous recessive parent, which generation is always completely heterozygous?a) F1 generation.b) F2 generation.c) F3 generation.d) P generation.

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[BOOK BIO] CLUTCH

Pedigrees

Genotype vs. Phenotype

Mendel's Laws

X-Inactivation

Incomplete Dominance vs. Codominance

Test Crosses

Autosomal Inheritance

Non-Mendelian Genetics

Mendel's Experiments

Epistasis

Dihybrid Crosses

Sex-Linked Inheritance

Introduction to Mendel's Experiments

Punnett Square Probability

Punnett Squares

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