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How can meiosis can result in a chromosome in the gamete that has parts of both chromosomes in a parents pair of homologous chromosomes?
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Why don't sex cells have homologous pairs of chromosomes?
you need one chromosome from one parent and one from the other parent. These homologous pairs each have the same genes but different alleles. For instance, one may code for black hair while the other codes for brown hair. You need both to be present in order to have both the parents traits.
How many chromosome do most human cells contain?
Humans have 22 pairs of homologous non-sex chromosomes (called autosomes), and one pair of sex chromosomes, making a total of 46 chromosomes in a genetically normal human.Each member of a pair is inherited from one of the two parents. In addition to the 22 pairs of homologous autosomes, female humans have a homologous pair of sex chromosomes (two Xs),while males have an X and a Y chromosome.
What is a pair of homologous chromosomes in meiosis?
synapsis
In humans the number of tetrads formed during mitosis is?
A tetrad is the pairing of homologous chromosomes. A human offspring inherits 23 chromosomes (N) from each parent upon fertilization, giving the offspring 46 chromosomes (2N). In meiosis, homologous chromosomes (N from mom and N from dad) come together and form a tetrad, which consists of 2 homologous chromosomes. Since you inherit a chromosome from both parents (2N) that pair up to form a tetrad, you will have 23 tetrads that have a chromosome from mom and dad paired together. 1 N from mom + 1 N from dad = homologous pair = 1 tetrad 2N/2 = N tetrad --humans--> 2(23 chromosomes)/2 = 23 tetrads Diploid#/2 = # tetrad
Why do which best describes the sex chromosomes in humans?
Humans have 22 pairs of homologous non-sex chromosomes (called autosomes), and one pair of sex chromosomes, making a total of 46 chromosomes in a genetically normal human.Each member of a pair is inherited from one of the two parents. In addition to the 22 pairs of homologous autosomes, female humans have a homologous pair of sex chromosomes (two Xs), while males have an X and a Y chromosome.
Parents can pass on chromosomes to their children that are different than their own when the new gene combinations are created by?
crossing over of homologous chromosomes during meiosis
Why don't sex cells have homologous pairs of chromosomes?
you need one chromosome from one parent and one from the other parent. These homologous pairs each have the same genes but different alleles. For instance, one may code for black hair while the other codes for brown hair. You need both to be present in order to have both the parents traits.
How many chromosome do most human cells contain?
Humans have 22 pairs of homologous non-sex chromosomes (called autosomes), and one pair of sex chromosomes, making a total of 46 chromosomes in a genetically normal human.Each member of a pair is inherited from one of the two parents. In addition to the 22 pairs of homologous autosomes, female humans have a homologous pair of sex chromosomes (two Xs),while males have an X and a Y chromosome.
What do homologous pairs do in meiosis?
Homologous chromosomes line up with each other during meiosis. They enter synapsis which results in crossing over and recombination. Then they segregate to the daughter cells. This results in genetic diversity among gametes.
What is a pair of homologous chromosomes in meiosis?
synapsis
In humans the number of tetrads formed during mitosis is?
A tetrad is the pairing of homologous chromosomes. A human offspring inherits 23 chromosomes (N) from each parent upon fertilization, giving the offspring 46 chromosomes (2N). In meiosis, homologous chromosomes (N from mom and N from dad) come together and form a tetrad, which consists of 2 homologous chromosomes. Since you inherit a chromosome from both parents (2N) that pair up to form a tetrad, you will have 23 tetrads that have a chromosome from mom and dad paired together. 1 N from mom + 1 N from dad = homologous pair = 1 tetrad 2N/2 = N tetrad --humans--> 2(23 chromosomes)/2 = 23 tetrads Diploid#/2 = # tetrad
How does meiosis introduce genetic variation in to offspring?
Meiosis produces gametes which then go on to participate in sexual reproduction. Sexual reproduction combines the genetic material of the two parents - therefore creating variation.
Why do which best describes the sex chromosomes in humans?
Humans have 22 pairs of homologous non-sex chromosomes (called autosomes), and one pair of sex chromosomes, making a total of 46 chromosomes in a genetically normal human.Each member of a pair is inherited from one of the two parents. In addition to the 22 pairs of homologous autosomes, female humans have a homologous pair of sex chromosomes (two Xs), while males have an X and a Y chromosome.
In a diploid cell what is the origin of each of the homologous chromosomes?
Homologous chromosomes in a diploid cell come from male and female parents during fertilization. Pairing of these chromosomes takes place during meiosis to interchange the genetic material to facilitate evolution among those organisms.
Which best describes chromosomes in humans?
Humans have 22 pairs of homologous non-sex chromosomes (called autosomes), and one pair of sex chromosomes, making a total of 46 chromosomes in a genetically normal human.Each member of a pair is inherited from one of the two parents. In addition to the 22 pairs of homologous autosomes, female humans have a homologous pair of sex chromosomes (two Xs), while males have an X and a Y chromosome.
How meiosis maintain a constant number of chromosome within a species?
Meiosis creates gametes (sperm and ova/eggs) which are involved in sexual reproduction. The result of meiosis is cells with half the number of chromosomes as a somatic (non-sex) cell. This ensures that when the gametes join during sexual reproduction, the resulting organism has the correct number of chromosomes (half from each gamete). Thus meiosis maintains the chromosome number.
Why are two genes found on the same chromosomes are not always linked forever?
Two genes found on the same chromosome are not always linked forever because of a process called genetic recombination or crossing over. During meiosis, the chromosomes undergo a process where they exchange genetic material, resulting in new combinations of genes. This process occurs during the formation of reproductive cells (sperm and eggs). Here's a step-by-step explanation: Homologous chromosomes: Each pair of chromosomes in an individual contains one chromosome from each parent. These pairs are called homologous chromosomes. Crossing over: During meiosis, homologous chromosomes pair up and exchange segments of genetic material in a process called crossing over. This results in the mixing and swapping of genes between the chromosomes. Independent assortment: In addition to crossing over, during meiosis, the homologous chromosomes segregate independently into separate cells. This means that the combination of genes from each parent chromosome can vary in the resulting cells. Recombinant chromosomes: As a result of crossing over and independent assortment, new combinations of genes are formed on the chromosomes. These new combinations are called recombinant chromosomes. The occurrence of crossing over and independent assortment allows for the shuffling of genetic material between chromosomes, leading to genetic diversity and the creation of new combinations of genes. As a result, two genes found on the same chromosome can become separated and inherited independently from each other in subsequent generations. It's important to note that the likelihood of two genes being separated by crossing over depends on the distance between them on the chromosome. Genes that are closer together on the chromosome are more likely to stay linked and be inherited together, while genes that are farther apart have a higher chance of being separated by crossing over. In summary, two genes found on the same chromosome are not always linked forever because of genetic recombination during meiosis, which allows for the shuffling and independent inheritance of genes. This process contributes to genetic diversity and the creation of new gene combinations in populations.
