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GregorMendel

MonohybridCrosses

Dihybrid Crosses Sex-Linked Pedigrees

Pea plants can be observed to be tall, medium, or short

in height?TRUE or FALSE

FalseMendel found different traits do not blend

Mendel obtained his F1 generation by the result of:

a. cross-pollination among parents and the next generation

b. cross-pollination between individuals of the parental p generation

c. bees pollinating the parental generationd. crosses between the offspring of a

parental cross

b. cross-pollination between individuals of the parental p generation

What are Mendel’sthree laws and explain

them.

1. The Law of Dominance2. The Law of Segregation3. The Law of Independent Assortment

If two heterozygous tall pea plants are crossed, what percentage of the F1

generation would be expected to have a short pea plant phenotype?

25%

Red coat colour in cats is produced by the homozygous genotype HRHR, blue coat color by the genotype HBHB, and

purple by the genotype HRHB. What kind of interaction is this known as, and what would be the phenotypic ratio of a

mating between two purple cats?

1 Blue: 1 Red: 2 PurpleIncomplete Dominance

Two parents are crossed to produce an offspring with type O blood. The genotypes of

the parents could be:

A) AA × ABB) Ai × AB C) BB × iiD) AB × iiE) Bi × Bi

Bi x Bi

Refer to the illustration above the box labeled “X” represents the phenotype __________

Round, yellow

In a certain plant, the alleles A, B, and C are dominant to the alleles a, b, and c. A

plant with the genotype AABbcc will have the same phenotype as the plant with the

genotype _____.

A) aabbcc B) AaBBccC) AAbbcc D) AABBCc

AaBBcc

In humans, dark hair is dominant over blonde hair and curly hair is dominant over straight hair. A woman

with dark, curly hair marries a man with blonde, curly hair. The woman is heterozygous for both traits and

the man’s father has straight hair. What is the probability as a percent that they will have a child

with blonde, straight hair?

12.5%

A sex-linked recessive gene n produces colour-blindness in humans. The normal gene is represented by the letter N. Give the genotype for a. a man who is normal. b. a female carrier. c. a man who is colour-blind.

a. XNYb. XNXn

c. XnY

If a woman was not colour blind and her father was

colour blind, what would be her genotype?

XNXn

Can a colour blind woman and a normal male have colour-

blind daughters? Colour blind Sons?

Explain your answer.

Daughters: NoSons: Yes

In a pedigree what shaperepresents a boy

and what shape representsa girl?

Square: BoyCircle: Girl

In the third generation, which are the offspring with the a/a

genotype?

2,3,5

What is the genotype of the second person in generation II?

Aa