Answered: Why do some genes express themselves…

Why do some genes express themselves later in life? Why not earlier? How many chromosomes in a human that has trisomy-15? How many chromosomes in a human that is triploid?

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 3CT: People with Down syndrome have an extra copy of chromosome 21, for a total of 47 chromosomes....

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Concept explainers

Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.

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Why do some genes express themselves later in life? Why not earlier?

How many chromosomes in a human that has trisomy-15?

How many chromosomes in a human that is triploid?

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Why are there no humans with monosomy 22? because chromosome 22 is very small, it is very stable and never experiences nondisjunction because there are some genes on chromosome 22 that require more than one copy per cell in order to express enough protein to carry out their essential function because humans don't have 22 chromosomes there ARE humans with monosomy 22
How many genes are there present on chromosome 7?
Why is chromosome 21 the smallest and not chromosome 22? considering that a karyogram is arranged from largest to smallest
Why is chromosome 15 absence affects?
A prairie grass species called "little bluestem" is tetraploid. It has four complete sets of chromosomes. There are ten kinds of chromosomes; in other words, each complete set of chromosomes has a total of 10 chromosomes. A single somatic cell (e.g., a cell in a leaf) will have 40 chromosomes, 4 of each kind of chromsome, i.e., 4 of the number 1 chromsome, 4 of the number 2 chromsome, etc. The illustration below shows prophase of meiosis 1 in chromosome number 10. In a diploid cell, there would be one tetrad (group of 4 chromatids) for each kind of chromosome. For example, there would be one tetrad for chromosome 8, one for chromsome 9, etc. When the tetraploid little bluestem undergoes meiosis, how many of chromosome number 10 will each sperm cell carry?
Why does chromosome 21 come first before chromosome 22? If chromosome 21 is smaller than chromosome 22, and if the karyogram is arranged from largest to smallest shouldn’t chromosome 22 be first over chromosome 21?
A company that offers PGD terms an embryo “normal and healthy” if it has 46 chromosomes. Why is this statement misleading? , Two famous male actors had twins using a surrogate mother who carried two embryos that hadbeen fertilized in vitro, one with one man’s sperm and the other with the other man’s sperm. In terms of genetics, how closely are the babies, a boy and a girl, related to each other if they have different fathers?
A typical somatic cell from a badger, which is a diploid, sexually reproducing animal, contains a total of 32 chromosomes. Gametogenesis in badgers is similar to humans. What is the genome size for the badger in terms of chromosome number? How many DNA molecules would be found in a secondary oocyte before dividing? How many chromosomes would be found in a cell at metaphase? How many DNA molecules should be in a tetraploid liver cell from the badger?
In some insects the female have two x chromosomes, while the males have One x chromosomes and no y chromosome .if the normal deploid number in an insect of this type is 14 what would be the number of chromosomes in the body cells of males and of females?
What is the number of sex chromosomes in male honey bees? We know that the chromosome set of males in honey bees is 1n and the chromosome set of female honeys is 2n, and based on this, the number of autosomal chromosomes in male honeybees is 16 chromosomes, and the number of autosomal chromosomes in female honey is 32 chromosomes, but if The male was haploid (1n) Will this make the number of autosomes equal to the number of sex chromosomes? Please clarify the answer
People with Down syndrome have an extra copy of chromosome 21, for a total of 47 chromosomes. However, in a few cases of Down syndrome, 46 chromosomes are present. This total includes two normal-looking chromosomes 21, one normal chromosome 14, and a longer-than-normal chromosome 14. Interpret this observation. How can these individuals have 46 chromosomes?
Human sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele? c. If a female is heterozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele?