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Does recombination always alter a cell's genotype?
Yes, recombination always alters a cell's genotype by creating new combinations of alleles in the offspring that are different from the parents. During recombination, genetic material is exchanged between homologous chromosomes, leading to genetic diversity in offspring.
Chromosomes that contain genes that will determine the sex of an individual are called?
XX=female XY=male the male's second allele determines the sex (gender) of the offspring. If it is a Y, congratulations you're having a boy. If it is an X, you're having a girl. The sex linked genes are always carried along the X chromosome. The female's chromosome is always XX.
Why do diploids always contain an even number of chromosomes?
Diploids have two sets of chromosomes, one inherited from each parent. Each set consists of homologous pairs, one from the mother and one from the father. Therefore, diploids always have an even number of chromosomes to ensure that each homologous pair can align properly during cell division.
What are the features used to identify homologous pairs of chromosomes?
Banding pattern – the size and location of Giemsa bands on chromosomes make each chromosome pair uniqueCentromere position – centromeres are regions in chromosomes that appear as a constriction. They have a special role in the separation of chromosomes into daughter cells during mitosis cell division
As a result of mitosis the two new cells have?
After Mitosis, you have a single cell with one nucleus, but inside that nucleus, you have two identical sets of chromosomes. . Mitosis is almost always immediately followed by cytokinesis, which is the process of dividing the nuclei (each with one set of chromosomes), cytoplasm, organelles, and cell membrane into two nearly identical cells.
What are the chromosomes called following this duplication?
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What does alleles always come in?
Alleles are generally inherited in pairs, except for alleles on the X and Y sex chromosomes in males.
Why does a puppy always have two alleles for every trait?
Because of homologous pairs of chromosomes. One chromosome from the puppies mother and one from the father make up the 78 chromosomes of dogs. One allele on the mom chromosome and one on the dad chromosome, even if there are more than two alleles for the trait only two will be represented in the genome.
Does recombination always alter a cell's genotype?
Yes, recombination always alters a cell's genotype by creating new combinations of alleles in the offspring that are different from the parents. During recombination, genetic material is exchanged between homologous chromosomes, leading to genetic diversity in offspring.
Why is the 23rd pair of chromosomes not always homologous?
The 23rd pair of chromosomes are the sex chromosomes. In female humans, both sex chromosomes are homologous, and characterized as XX. In male humans, one sex chromosome is an X chromosome and the other is a much smaller, nonhomologous Y chromosome, and is characterized as XY.
What happens during crossing-over?
During crossing-over, homologous chromosomes exchange genetic material, leading to the recombination of alleles. This process increases genetic variation in offspring by producing new combinations of alleles. Crossing-over occurs during meiosis, specifically during prophase I.
What type of chromosome always carry gene for the same trait at the same location on both chromosome?
homologous chromosomes
Why do diploids always contain an even number of chromosomes?
Diploids have two sets of chromosomes, one inherited from each parent. Each set consists of homologous pairs, one from the mother and one from the father. Therefore, diploids always have an even number of chromosomes to ensure that each homologous pair can align properly during cell division.
Chromosomes that contain genes that will determine the sex of an individual are called?
XX=female XY=male the male's second allele determines the sex (gender) of the offspring. If it is a Y, congratulations you're having a boy. If it is an X, you're having a girl. The sex linked genes are always carried along the X chromosome. The female's chromosome is always XX.
Which gender is homozygous?
Homozygous means "the same egg." That refers to identical twins. Identical twins are always the same gender since they have the same chromosomes.
Why can fraternal twins different genders but identical are always the same gender?
fraternal twins have two different chromosomes
What are the features used to identify homologous pairs of chromosomes?
Banding pattern – the size and location of Giemsa bands on chromosomes make each chromosome pair uniqueCentromere position – centromeres are regions in chromosomes that appear as a constriction. They have a special role in the separation of chromosomes into daughter cells during mitosis cell division
