Exam 14: Patterns of Inheritance

The inheritance pattern where two or more genes do not assort independently because they are close together on the same chromosome is called

If you were to examine a typical population at a single locus,you would find more copies of the wild-type allele than any other allele.

In mammals,males are ________ and females are _______ for their sex chromosomes.

You are mapping the location of two genes in Drosophila,listless l and blind b.(l⁺ l⁺ b⁺ b⁺)and (l⁺ l b⁺ b)flies are normal,but (l l b b)flies don't move around very much and cannot detect the location of a light source.You perform a cross between a true-breeding normally active,sighted fly and a true-breeding listless,blind fly.You testcross an F1 individual with an individual homozygous recessive for both traits and get the following results: Listless,sighted: 100 Listless,blind: 400 Normal activity,sighted: 400 Normal activity,blind: 100 The recombination frequency observed in experimental crosses can be used to indicate distances between genes on a chromosome.More specifically,the map distance in map units between two genes is equal to the frequency of recombinant offspring.What is the distance between these two genes?

Which of the following organelle(s)has/have a genome separate from the genome in the cell nucleus?

Environment can have an influence on the range of phenotypes seen in a population.

A locus encodes different genes in different individuals of the same species.

You breed a black,long-haired rabbit with a white,short-haired rabbit.All of the offspring have long,black hair.If the genes for hair color and length are closely linked on the same chromosome,what would you expect to see in the F₂ generation?

Human males produce

Eyelash length is an inherited trait.In the human population,there is an eyelash length gene.There are two possible variants of this gene - an allele for long eyelashes (> 1cm)and an allele for short eyelashes (1 cm or less).The allele for long eyelashes is dominant (L)and the allele for short eyelashes is recessive (l).An individual who is heterozygous for eyelash length would have which of the following phenotypes?

Eyelash length is an inherited trait.In the human population,there is an eyelash length gene.There are two possible variants of this gene - an allele for long eyelashes (> 1cm)and an allele for short eyelashes (1 cm or less).The allele for long eyelashes is dominant (L)and the allele for short eyelashes is recessive (l).An individual who is heterozygous for eyelash length would have which of the following genotypes?

A mutation in a single gene always has only one discrete effect on an individual's phenotype.

Mendel used garden peas to study inheritance patterns,but other plants would have worked as well.Study the characteristics of the plants below,and determine which would be the best model organism to study inheritance patterns.

In humans,freckles are inherited via a simple Mendelian pattern.A male is heterozygous for freckles,and he has freckles.If he marries a woman who is also heterozygous for freckles,______ percent of their children will be freckled and __________ percent of their children will be heterozygous.

In dogs,there is a hereditary deafness caused by a recessive allele,d.A kennel owner has a male dog that she wants to use for breeding purposes if possible.The dog can hear,but the owner is unsure of the genotype.She does a testcross (crosses it to a homozygous recessive dog),and two of the five offspring are deaf.This means that the male dog

Huntington disease is a neurodegenerative genetic disorder that typically manifests itself around age 40.A 25-year-old woman comes to your genetic counseling center because she knows that Huntington disease occurs in members of her father's family.Her paternal grandfather was afflicted,but so far her 50-year-old father shows no symptoms.Her two great-great grandmothers on her father's side were healthy well into their 90s,but one of her great-great grandfathers died of unknown causes at 45.Testing for Huntington disease is extremely expensive,but she is concerned that she may fall victim to this disease and wants to plan her life accordingly.After examining her pedigree you advise her to

An X-linked gene is

What data would you expect to see regarding the distribution of phenotypes from a cross of purple pea plants that are heterozygous for flower color and plant height? (Purple is dominant to white;dwarf is dominant to tall. )

A gene for sweat gland production is located on the X chromosome.A man who lacks sweat glands marries a woman who has normal sweat glands.Which of the following are possible phenotypes of their children?

If a male cat with orange fur produces female offspring with calico fur,what color was the mother cat?