Exam 11: The First Geneticist: Mendel and His Discoveries

If a plant heterozygous for the genes for both seed color and shape is self-fertilized,the ratio of offspring with smooth,green seeds is ________/16.(Yellow and smooth are the dominant phenotypes.)

Refer to the figure below, and then answer the question that follows. -In a dihybrid cross,if heterozygotes are crossed,what fraction of the offspring is expected to have both the dominant phenotypes?

In humans,"unattached" earlobes are dominant over "attached" earlobes.Widow's-peak hairline is dominant over non-widow's-peak hairline.Use E and e for the earlobe phenotype alleles and W and w for the hairline phenotype alleles.A woman and a man,both with genotype EeWw,have a child.What is the probability that the child will have attached earlobes and a widow's peak?

The physical characteristics of an organism,or its ________,are determined by its genetic makeup,referred to as its ________.

Cystic fibrosis (CF)is caused by a recessive allele.A child has CF,even though neither of his parents has CF.This couple also has a child who does not have CF.What is the probability the unaffected child is heterozygous?

Mendel crossed true-breeding pea plants and found the dominant trait always appeared in the F₁ generation,but it appeared in a ________ ratio of dominant to recessive in the F₂ generation.

The inheritance of curly hair illustrates incomplete dominance.When a curly haired individual reproduces with a straight-haired one,the children all have wavy hair.What offspring would be produced,in what proportions,when two people with wavy hair reproduce?

What is the significance of multiple alleles?

Widow's-peak hairline in humans is dominant to non-widow's-peak hairline.If a person has a widow's-peak hairline,what is his or her genotype?

In order to track the inheritance of a single character,you would need to do a:

In Mendel's pea plants,yellow seeds are dominant to green seeds.Purple flowers are dominant to white flowers.Use Y and y for the seed color alleles and P and p for the flower color alleles.Flower color and seed color assort independently.If a plant that is heterozygous for both flower color and seed color genes is self-fertilized,what proportion of the offspring will have one of the dominant phenotypes,either the seed color or flower color,but not both?

When two identical alleles for a character are present,the genotype is referred to as:

The seeds in a pod of one of Mendel's pea plants are:

If an individual exhibits a recessive trait,which of the following statements can you be sure of?

In Mendel's pea plants,yellow seeds are dominant to green seeds.Purple flowers are dominant to white flowers.Use Y and y for the seed color alleles and P and p for the flower color alleles.Flower color and seed color assort independently.What is the relationship between the Y and P?

The Law of Independent Assortment states that:

Which of the following represents a dihybrid cross?

Consider the following information for a dihybrid cross.The dominant allele F codes for freckles,whereas the recessive allele f codes for no freckles.The dominant allele E codes for long eyelashes,whereas the recessive allele e codes for short eyelashes.Both parents have the genotypes of ee and Ff.Indicate the following: (1)the phenotype of both parents,(2)the possible gametes that each parent can make,(3)all of the possible phenotypes for the offspring,and (4)the phenotypic ratio obtained after the Punnett square is drawn.

A plant that produces white flowers is crossed to a plant that produces orange flowers.All the offspring produced pale orange flowers.What can you conclude?

The phenotype of an organism can be influenced by: