What happens when you cross a white-eyed female fruit fly with a red-eyed male fruit fly?
A white-eyed female fruit fly is crossed with a red-eyed male. Red eyes are dominant, and X-linked. What are the expected phenotypes of the offspring? All of the females will have red eyes; half of the males will have red eyes, and half of the males will have white eyes.
What are the phenotypic ratios of a white-eyed female is crossed with a red-eyed male?
When white-eyed males are crossed with red-eyed females, all the F1 progeny have red eyes, showing that the allele for white is recessive. Crossing the red-eyed F1 males and females produces a 3:1 F2 ratio of red-eyed to white-eyed flies, but all the white-eyed flies are males.
Do white-eyed males inherit the allele for white eyes from their father or their mother?
-His father must also have had white eyes. His mother had at least one white allele. (Because this male had white eyes, he must have inherited a white allele from his mother.)
What is the genotype for a purebred fly with white eyes?
EE
Why is the White eyed characteristic more common in males?
No females have white eyes because they received one of their X-chromosomes from their hemizygous dominant, red-eyed father. X-linked recessive phenotypes are more commonly observed in males because males are hemizygous for sex-linked traits.
Why are white eyed female fruit flies so rare in nature?
Because the white-eye allele is recessive, a female will have white eyes only if she has the white-eye allele on both her X chromosomes.
What is the genotype of a red eyed male?
Homozygous dominant for the red encoding allele – genotype: XWXW; phenotype: red eyes. Heterozygous – genotype XWXw; phenotype: red eyes. Homozygous recessive with two white encoding alleles – genotype XwXw; phenotype white eyes.
What is the genotype of a male?
The mother’s set combines with the father’s, resulting in 23 pairs of chromosomes that contain the genetic information that determine everything from sex to eye color. The sex of an embryo is determined at the moment of conception. The sex genotype for a human male is denoted as XY.
What is the genotype of a male fruit fly?
Single-Gene Test Crosses In order to set up your test cross, you must first realize that the male fly has one of two possible genotypes: Ee or EE. Because the male exhibits the dominant body color phenotype, you must cross it with a female with the homozygous recessive phenotype and genotype.
How can you tell if a fruit fly is male or female?
There are several characteristics that differentiate males from females. The most simple characteristic to use to differentiate the two is to look at the genitalia of the flies. Males have dark, rounded genitalia at the tip of their abdomen, whereas females have light, pointed genitalia.
What cross will result in all heterozygous offspring?
P cross
What is the percentage of heterozygous offspring?
The Punnett square below makes it clear that at each birth, there will be a 25% chance of you having a normal homozygous (AA) child, a 50% chance of a healthy heterozygous (Aa) carrier child like you and your mate, and a 25% chance of a homozygous recessive (aa) child who probably will eventually die from this …
What is an example of a heterozygous trait?
If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair. The relationship between the two alleles affects which traits are expressed.
How do you know if you are homozygous or heterozygous?
Because an organism has two sets of chromosomes, it usually only has two options to choose from when determining phenotype. If an organism has identical genes on both chromosomes, it is said to be homozygous. If the organism has two different alleles of the gene it is said to be heterozygous.
Are blue eyes homozygous or heterozygous?
Being homozygous for a particular gene means you inherited two identical versions. It’s the opposite of a heterozygous genotype, where the alleles are different. People who have recessive traits, like blue eyes or red hair, are always homozygous for that gene.
Is FF heterozygous or homozygous?
Heterozygous individuals suffer from the disease….Mendelian Genetics.
| Genotype | Phenotype | |
|---|---|---|
| F F | Homozygous dominant | No cystic fibrosis (Normal) |
| F f | Heterozygous | Carrier (has no symptoms but carries the recessive allele) |
| f f | Homozygous recessive | Cystic fibrosis (has symptoms) |
Is TT a heterozygous or homozygous?
| Genotype Symbol | Genotype Vocab | Phenotype |
|---|---|---|
| TT | homozygous DOMINANT or pure tall | tall |
| Tt | heterozygous or hybrid | tall |
| tt | homozygous RECESSIVE or pure short | short |
What are the 3 laws of inheritance?
The key principles of Mendelian inheritance are summed up by Mendel’s three laws: the Law of Independent Assortment, Law of Dominance, and Law of Segregation.
What type of genotype is considered purebred?
Purebred – Also called HOMOZYGOUS and consists of gene pairs with genes that are the SAME. Hybrid – Also called HETEROZYGOUS and consists of gene pairs that are DIFFERENT. Genotype is the actual GENE makeup represented by LETTERS. Phenotype is the PHYSICAL appearance of a trait, such as a YELLOW (or BLUE) body color.
Is TT a purebred?
The result of this cross was all tall hybrid pea plants (Tt). When these second-generation plants were crossed, the result was one tall (TT) purebred; two tall (Tt) hybrids; and one short (tt) purebred. Mendel concluded that tallness in pea plants was dominant, and became the expressed trait, (uppercaseT).
What is a purebred trait?
A true-breeding organism, sometimes also called a purebred, is an organism that always passes down certain phenotypic traits (i.e. physically expressed traits) to its offspring of many generations. In a purebred strain or breed, the goal is that the organism will “breed true” for the breed-relevant traits.
How did Mr Krabs die?
Krabs was found dead inside of the Krusty Krab restaurant. His throat had been cut. The coroner concluded that the wound on Mr. Krabs’s throat was caused by a metal spatula.
Is Sandy pregnant?
Sandy, Sodapop’s girlfriend, gets pregnant and moves to Florida with her grandmother. Sodapop writes to her, but his letters return unopened.
How did Sandy Cheeks die?
Sandy Cheeks death Death (In Blue Ink’s Timeline) Sandy Cheeks died at the age of 44 on July 14, 2017, just several days after her birthday and after she overdosed on heroin and cocaine multiple times during the 2017 Vans Warped Tour.