0
Ablack mouse is mated with a brown mouse and all offspring are black expalin full why no brown offspring are produce?
Genetically speaking, there are roughly 8 well known 'Brown' mice. They all have different genes, which creates different shades. You should probably find out what shade of brown this 'Brown' mouse in question is.
There is only one type of Black genetic colouring in mice.
Generally speaking, if we were just using the common Agouti brown mouse (wild colour) & crossed it to Black, then the entire litter should've resulted in Agouti mice. However, Agouti being represented by a dominant A-, & the Black being represented by a recessive AA, crossing A- to AA would result in an entire litter of Aa = Agouti carring Black.
If you crossed one of those offspring back to the Black parent, you would get Aa & AA in the litter, resulting in the litter being 50% black, 50% Agouti.
However, if the 'Brown' mouse wasn't Agouti, & was actually another brown called Chocolate (I'm serious), then crossing Black (which in this case will be BB) to Chocolate (bb) would result in an entire litter of Blacks carrying Chocolate (Bb) . If you crossed 2 of the offspring together, you would get a mix of Blacks & Chocolates.
NB: Black is a dominant gene to all other genes but Agouti.
What else can I help you with?
If two white sheep produce a black offspring the parent's genotypes for colr must be?
If two white sheep produce a black offspring, the parent's genotypes for color must be heterozygous, meaning both parents carry one allele for white (let's denote it as "W") and one allele for black (denote it as "B"). This results in the genotype "WB" for each parent, allowing for the possibility of producing a "BB" genotype (black) offspring when both parents contribute the black allele. Therefore, the parents are most likely "WB" (white) and "WB" (white).
Do black widows have egg sacs without mating?
No, black widows need to mate in order to produce fertilized eggs that will develop into viable offspring. Without mating, the eggs will not be fertilized and will not hatch into spiderlings.
How can you explain the fact that the offspring that has a BB genotype and one that has a Bb genotype are both black?
The "B" allele codes for a black coat color, so offspring with a BB or Bb genotype will both have a black coat due to the dominant nature of the "B" allele. The presence of at least one "B" allele ensures that the offspring will express the black coat color phenotype.
What is the probable phenotype and genotype of offspring of a cross between a horse homozygous for black color and a horse homozygous for chestnut color?
The probable phenotype of the offspring would be black, as black color is dominant over chestnut color. The genotype of the offspring would be heterozygous for black (Bb), since one parent is homozygous black (BB) and the other is homozygous chestnut (bb).
Is black faeces good?
Black stools can indicate the presence of blood in the stool, which could be a sign of a bleeding ulcer or other gastrointestinal issues. It's important to consult a healthcare provider if you have black stools as it may require further investigation.
Can two black-coated guinea pigs produce an offspring with a whit coat?
Yes
Can rattlesnakes and black rat snakes interbreed and produce venomous offspring?
No, rattlesnakes and rat snakes cannot interbreed.
What are some examples that illustrate the differences between incomplete dominance and codominance in genetic inheritance?
Incomplete dominance occurs when the offspring's phenotype is a blend of the parents' traits, such as when a red flower and a white flower produce pink offspring. Codominance, on the other hand, results in both parental traits being expressed equally in the offspring, like when a black chicken and a white chicken produce offspring with both black and white feathers.
Is it possible that the cross between two black Guinea pigs in puberty square a would not produce a white guniea pig?
Yes, it is possible for a cross between two black guinea pigs to produce offspring that are not white. If both black guinea pigs carry recessive genes for coat color, such as the gene for white fur, there is a chance their offspring could inherit those genes and be white. However, if both parents are homozygous for the black coat color, all offspring will be black. Thus, the outcome depends on the specific genetic makeup of the parent guinea pigs.
If two white sheep produce a black offspring the parent's genotypes for colr must be?
If two white sheep produce a black offspring, the parent's genotypes for color must be heterozygous, meaning both parents carry one allele for white (let's denote it as "W") and one allele for black (denote it as "B"). This results in the genotype "WB" for each parent, allowing for the possibility of producing a "BB" genotype (black) offspring when both parents contribute the black allele. Therefore, the parents are most likely "WB" (white) and "WB" (white).
A cross between a white rooster and a black hen is 100 percent blue offspring when two of these offspring are mated the probable phenotypic ratio seen in their off spring would be what?
If you crossed a black hen/roo with a white hen/roo, the offspring would NOT be blue. If he was recessive white, the chicks would be black. If he was dominant white, the chicks would be white with some black "smudges" or "spots". The only way to produce 100% blue chicks is to cross a black roo over splash hens or a splash rooster over black hens.
Offspring of a white hen and a black rooster are grey?
No, not always. The offspring can be white, black, black and white or shades of both.
A researcher studying inheritance found that when black mice were crossed with white mice all the offspring produce were gray. What is this an example of?
This is an example of incomplete dominance.
How many offspring do the female black bear have in one year?
none black bears have no offspring in one year
Do black widows have egg sacs without mating?
No, black widows need to mate in order to produce fertilized eggs that will develop into viable offspring. Without mating, the eggs will not be fertilized and will not hatch into spiderlings.
Average number of offspring for a black bear?
the average offspring of a bear is 2. But the offspring depends on the species.
A female quinea pig homozygous dominant for black fur color is mated with a male homozygous for white fur In a litter of eight offspring there would probably be?
To answer this, first determine the genotypes of the parents. The female is homozygous dominant, which means it carries two copies of the black allele (which we will designate B), so its genotype we can represent as BB. The male is homozygous for the recessive trait (white, designated as b), so its genotype can be represented as bb. So the cross looks like this: BB X bb Next, we must determine the types of gametes each parent can produce. In this case it's easy, because both are homozygous. The female can only produce B gametes, while the male can only produce b gametes. Since the offspring carry one allele from each parent, all of the offspring can have only one genotype: Bb. Since black (B) is the dominant allele, and every offspring carries the dominant allele, all eight of the offspring from this cross will be black.
