Gametes may carry different combinations of alleles because of?
Crossing over and random alignment of chromosomes
The alleles of the f1 offspring will depend on the alleles of the parents. In theory all of the alleles in the parental genotypes could be present in the f1 generation. To work out which combinations of alleles will be present in the f1 generation/the proportion with one allele etc. you would need to draw some kind of cross. AA x Aa A A A AA AA a aA aA So the f1 offspring have…
recombinants are formed in prophase I because that is when crossing over occurs. Crossing over brings the alleles together into new combinations, switching two traits but not all of them. Then in the following steps of meiosis the recombinants are distributed into different gametes, resulting into recombinant phenotypes.
Only two different gametes (sex cells) can be created using a combination of AabbCCdd. This is because Aa is the only gene with two different alleles (A and a). The other genes have two copies of the same allele - therefore that is all that the gamete can contain. So the two different gametes possible are: AbCd and abCd
A faster way to do it is by (2^n) where 2 is the number of alleles and n is the number of genes, so we have 2^3 = 8. so we have 8 possible combinations. Assuming you are asking how many different types of gametes can an individual with the genotype AaBbCc make. To answer we must first make one assumption: each gene resides on a different chromsome. The reason we do that is to…
Hello, Different people have different colored eyes because there are different alleles for eye color. These alleles may tell the eye color to be black, blue, green... and different individuals are likely going to have different allele due to the wide variety of the alleles. This is just like how people have different skin colors and hair colors, different alleles will make the human into a different appearance. Good Luck
Sexual reproduction produces individuals with genes from two parents, which increases the combinations of alleles possible in a population. This increase in combinations of alleles can be useful when changes in the environment occur requiring new adaptations. Populations with large stores of variation can, in general, adapt better to those changes because they already have the necessary variation in place.
Zygous comes from the Greek root zygos, meaning 'yoked', that is 'linked together' as one does horses or oxen to pull a vehicle. It can loosely be thought of as 'part of a pair'. Thus we have a homozygous individual who has two identical alleles in a pair, or a heterozygous one which has two different alleles. We also see the root in 'zygote', a fertilised egg, because it is formed from two gametes joined…
What is a gamete In terms of the number of alleles for each gene what general statement can you make about how gametes differ from other cells in a mature pea plant?
How does the base sequence on DNA determine a particular feature and different forms or variations of that feature?
You have different alleles, one father and one mother allele, so the base sequences code for proteins and different alleles code for different proteins. This you get different features and the variations on those features because you can have more than two alleles for a trait, though one individual can only have two at a time.
The product of meiosis are sex cells or gametes 1N, Eggs, Sperm and pollen. Because of meiosis, and crossing over, these cells are genetically unique. Consequently, the union of these sex cells (egg and sperm) form new and different combinations and therefore allow for variation and change within a species.
Humans have two sets of their chromosomes, one from each parent. Two different alleles for a trait are two different versions of a gene, one usually coming from each parent. Alleles are referred to a dominant or recessive. A trait can be homozygous dominant (both the same dominant allele), heterozygous (one dominant and one recessive), or homozygous recessive (both recessive). "Dominant" alleles are named so because when they are paired with a recessive allele, the…
When hybrids for a certain characteristic are crossed Aa x Aa the recessive genotype AA may appear in some of the offspring because of what?
Probability is the term for the chance that any specific genotype will occur in the offspring from the mating of parents. Typically the capital letter A (in this example) represents the dominant allele as opposed to the recessive allele. The probability of the possible genotypes in a monohybrid cross is 1AA:2Aa:1aa. The probability of AA is .25 or 25%.
Mendel's law of segregation applies to what a.all forms of life b. applies to sexually reproducing organisms c.applies to asexually reporducing organism d. only unicellular organisms e. is invalid?
b.applies to sexually reproducing organisms because according to Mendel's law of Segregation, TWO alleles for a heritable character segregate (separate) during gamete formation and end up in different gametes, thus an egg or a sperm gets only one of the two alleles that are present in the SOMATIC cells of organisms make the gamete
This is because during meiosis there is (mostly) genetic variation by means of crossing over, independent assortment and mutations. As two gametes are being fused, the end product will be different from the parent, because the factors mentioned above ensure this. For a bit more info: The end product might not always be different as sometimes (in a very rare case), independent assortment and mutations might not occur to the two gametes which are to…