Dihybride Crosses flashcards


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Define sexual reproduction? sexual reproduction is the formation of offspring that genetically differ from their parents
The mechanism by which sex is determined is known as? sex determination
Female (human) cells have ____ X chromosomes? two
Males cells have one ____ and one _____ chromosome one X and one Y chromosome
what are individuals with both sexes present called? hermaphrodites
Individuals that have both male and female sexes are called? monoecious
Individuals that either have male or female reproductive systems are known as? dioecious
Are humans monoecious or dioecious? dioecious
In dioecious individual, the sex is determined _______ chromosomal, genetically or environmental
what does the chromosome theory of inheritance state? it states that genes are located on chromosomes
what are autosomes? they are nonsex chromosomes, they are the same in males and females
where is the XX-XO sex determination mechanism found? it is found in grasshoppers
In XX-XO sex determination, females have ____ number of chromosomes? two X chromosomes
What does a O chromosomes mean? it means that there is an absence of sex chromosomes
what are heterogametic sex? males, because they produce two different types of gametes
what are homogametic sex? Females which produce gametes that are the same with respect to sex chromosomes
How are XO zygotes formed? when sperm lacking an X chromosome combines with X bearing egg
How are XX zygotes formed? when sperm with X chromosome unite with X bearing egg
What is the shape of the Y chromosome? acrocentric, not Y shaped commonly thought
In XX-XY sex determination, the male is the _______ sex heterogametic sex
In XX-XY sex determination, the female is the _______ sex homogametic sex
What are some organisms that have the XX-XY sex determination mechanism?, some plants, insects, reptiles, all mammals
In ZZ-ZW sex determination, the female is the _______ sex heterogametic
In ZZ-ZW sex determination, the male is the _______ sex homogametic
Why are the chromosomes labeled Z and W to reduce confusion with XX-XY sex determination
In ZZ-ZW sex determination the female's chromosomes are ZW
In ZZ-ZW sex determination the male's chromosomes are ZZ
Where is the ZZ-ZW sex determination found in nature it is found in birds, moths, some amphibians and some fish
In some insects with no sex chromosomes, sex is based on? based on the number of chromosome sets found in the nucleus of each cell
Males develop from? unfertilized eggs
Females develop from? fertilized eggs
The cells of females have ____ sets of chromosomes two
The cells of males have ____ sets of chromosomes one. The cells are haploid
In drosophila does the Y chromosome determine maleness No it does not determine maleness
How is the sex determined in drosophila? it is determined by a balance between genes on the autosomes and genes on the X chromosome
What type of sex determination does drosophila have? genic balance system
what is genic balance system? this is where genes influence the sexual development of each individual
In drosophila the X chromosome contains genes with _____ producing effects? female
In drosophila the autosomes contains genes with _____ producing effects? male
What is the type of ratio that determine sex in drosophila the X:A ratio
An X:A ratio of 1 will produce a? female
An X:A ratio of 0.5 will produce a? male
An X:A ratio lower than 0.5 will produce a? will produce a male phenotype, but the fly will be weak and sterile
what is a meta males? this are flys that are produced from an X:A ration of less that 0.5. Flys are weak and sterile
An X:A ratio of between 1 and 0.5 will produce an? intersex fly with a mix of male and female characteristics
An X:A ratio is greater than 1 will produce a? female phenotype, but the fly have developmental issues
what is a metafemale? it is a female produced from a X:A ratio greater than 1
Persons with turner syndrome are mostly females
Do females turner syndrome have menstration? no they do not have menstration
What are some characteristics of females with turner syndrome? they are short, they have a low hairline, broad chest, neck skin folded
what are they intellectually their intelligence is normal
Can women with turner syndrome reproduce? they are normally sterile
Turner syndrome have a single _____ chromosome, X chromosome
Persons with Klinefelter syndrome are mostly? males
What is the chromosomal makeup of persons with Klinefelter syndrome? They have one or more Y chromosomes and multiple chromosomes e.g XXY
what are some characteristics of males with Klinefelter syndrome?, they have small testicles, some breast enlargement, reduced facial hair, sterile, taller than normal
what are some characteristics of individuals with triplo-X syndrome? they tend to be taller and thinner, few are sterile
Are individuals with triplo-X syndrome normal? individuals with triplo-X syndrome have a greater chance of being mentally retarded

Define sexual reproduction?

The mechanism by which sex is determined is known as?

Female (human) cells have ____ X chromosomes?

Males cells have one ____ and one _____ chromosome

what are individuals with both sexes present called?

Individuals that have both male and female sexes are called?

Individuals that either have male or female reproductive systems are known as?

Are humans monoecious or dioecious?

In dioecious individual, the sex is determined _______

what does the chromosome theory of inheritance state?

what are autosomes?

where is the XX-XO sex determination mechanism found?

In XX-XO sex determination, females have ____ number of chromosomes?

What does a O chromosomes mean?

what are heterogametic sex?

what are homogametic sex?

How are XO zygotes formed?

How are XX zygotes formed?

What is the shape of the Y chromosome?

In XX-XY sex determination, the male is the _______ sex

In XX-XY sex determination, the female is the _______ sex

What are some organisms that have the XX-XY sex determination mechanism?,

In ZZ-ZW sex determination, the female is the _______ sex

In ZZ-ZW sex determination, the male is the _______ sex

Why are the chromosomes labeled Z and W

In ZZ-ZW sex determination the female's chromosomes are

In ZZ-ZW sex determination the male's chromosomes are

Where is the ZZ-ZW sex determination found in nature

In some insects with no sex chromosomes, sex is based on?

Males develop from?

Females develop from?

The cells of females have ____ sets of chromosomes

The cells of males have ____ sets of chromosomes

In drosophila does the Y chromosome determine maleness

How is the sex determined in drosophila?

What type of sex determination does drosophila have?

what is genic balance system?

In drosophila the X chromosome contains genes with _____ producing effects?

In drosophila the autosomes contains genes with _____ producing effects?

What is the type of ratio that determine sex in drosophila

An X:A ratio of 1 will produce a?

An X:A ratio of 0.5 will produce a?

An X:A ratio lower than 0.5 will produce a?

what is a meta males?

An X:A ratio of between 1 and 0.5 will produce an?

An X:A ratio is greater than 1 will produce a?

what is a metafemale?

Persons with turner syndrome are mostly

Do females turner syndrome have menstration?

What are some characteristics of females with turner syndrome?

what are they intellectually

Can women with turner syndrome reproduce?

Turner syndrome have a single _____ chromosome,

Persons with Klinefelter syndrome are mostly?

What is the chromosomal makeup of persons with Klinefelter syndrome?

what are some characteristics of males with Klinefelter syndrome?,

what are some characteristics of individuals with triplo-X syndrome?

Are individuals with triplo-X syndrome normal?

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