Can a trisomic A/A/a ever produce a gamete of genotype a? Answer: Yes. You would expect that one-sixth of the gametes would be a.
How can a trisomic cell produce a normal gamete?
- Nondisjunction only results in gametes with n+1 or n–1 chromosomes.
- Nondisjunction occurring during meiosis II results in 50 percent normal gametes.
- Nondisjunction during meiosis I results in 50 percent normal gametes.
- Nondisjunction always results in four different kinds of gametes.
Is a genotype A gamete?
Genotype refers to the genetic makeup, composition, or structure of a specific organism. Gamete refers to the cell. It can be a male cell. … Each gamete carries half a genotype, since each gamete (whether this is a male gamete or a female gamete) is a haploid, a single set of chromosomes.
What gametes can a heterozygous produce?
Meiosis in a heterozygous meiocyte results in haploid products (for example, gametes) half of which carry one allele, and half the other allele; for example, A / a → 1/2 A and 1/2 a .
What are the gametes that can be formed by a person who carries AA genotype?
An individual with the genotype Aa can make two types of gametes: A and a. Since this is a random process, the individual will, on average, make equal numbers of each gamete. (Frequency of 1/2 for each gamete). A second individual with genotype Aa can make two types of gametes: A and a.
Is Monosomy worse than trisomy?
In general, a monosomic for a particular chromosome is more severely abnormal than is the corresponding trisomic.
What is phenotype example?
Examples of phenotypes include height, wing length, and hair color. Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.
How can you tell how many gametes a genotype can produce?
The number of gametes produced by a specific genotype is calculated by the formula 2n, where n= number of heterogeneous alleles present in the genotype. Here, the given genotype consists of two heterogeneous alleles Aa and Bb while CC is homozygous. So, it can produce 22 = 4 types of gametes.
What is an example of heterozygous?
Your genes are made of DNA. … 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.
How many gametes can aa form?
Hints For Biology 101 Exam #4
|No. of homologous chromosome pairs (heterozygous genes)||No. of different gametes from each parent|
|1 (Aa X Aa)||2 (21)|
|2 (AaBb X AaBb)||4 (22)|
|3 (AaBbCc X AaBbCc)||8 (23)|
|4 (AaBbCcDd X AaBbCcDd)||16 (24)|