Having two sets of chromosomes is known as (2n) _______diploid___________. ANSWER: 6. Eggs and sperm are _______haploid_________ (n). ANSWER: Next Give one characteristic of each of the following phases of Meiosis I. Prophase I: During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis Metaphase I: Bivalents, each composed of two chromosomes align at the metaphase plate Anaphase I: Each of the daughter cells is now haploid Telophase I: Nuclear envelopes may reform 7. Does the S phase (DNA replication) occur after Meiosis 1?
Or each chromosome of a pair can be individually picked. 16. Explain two ways in which children can have different chromosomes (gene variation) than their mother or father. Random separation of chromosomes (law of segregation) when forming sperm/ova during anaphase I, crossing over of some genes to the homologous chromosomes during prophase I, and mutation during S
The long, thin ascus causes both meiotic spindles and the mitotic spindles to be aligned during spore formation. As a result, the positioning of the ascospores directly reflects the arrangement of homologous chromosome pairs during metaphase I of meiosis (Glase, 1995). This allows us to detect which alleles were exchanged creating crossovers. Sexual reproduction in the S. fimicola is important because an it allows for a significant source of genetic variability, and allows the fungus to adapt to new environments (Fincham, 1971). This genetic variability is obtained when crossovers occur between
If these androgens are released the Wolffian system will develop which leads to a male foetus. However if this hormone is not released the Mullerian system develops forming a female. The presence of the Y chromosome is responsible for the release of the androgens testosterone or dihydrotestosterone which interrupt the female developments. It is thought that humans are born with instinctive behaviours defining them either female or male. Milton Diamond provided evidence for this idea in his experiments with rats.
Everyone has 23 pairs of chromosomes; one of those is a sex chromosome which determines a person’s sex. The mother carries two X chromosomes while the father carries one X chromosome and one Y chromosome. With a Y chromosome present, the developing fetus will develop male genitalia and will become male. With two X chromosomes present, the developing fetus will develop female genitalia and will become female. However, complications may occur that can alter a person’s appearance, making a biological male appear to be female, and a biological female appear to be male.
What about identical twins that are separated at birth but yet have strikingly similar views, preferences, tastes and abilities? The only feasible explanation is that these traits are biological in nature. Could this be said for all factors that make up our own individual personalities? This essay will explain why biology can be a rational explanation for these traits using examples from current and past research and from theoretical evidence. The study of the human genome project has allowed for the complete sequencing of human DNA for the first time.
There are two types of chromosomes (male or female) X and Y, also known as the sex chromosomes. The chemical responsible for inherited characteristics and gender. They are found within DNA and protein seen in a dividing cell. Cytoplasm: The cytoplasm refers to all cell material outside the nucleus but within the cell boundary. This is a gel like fluid where chemical reactions take place.
The type of Down syndrome depends on how many cells have the extra or abnormal chromosomes. Medical experts believe the cell changes most often start in a woman's egg before or at conception. Less often, the error occurs in sperm at conception. It is not known what causes the cells to divide abnormally. One type of Down syndrome, called translocation-type, may be passed down through families which are inherited”.
Females have two x chromosomes and males have an x and a y. Genes are portions of DNA that perform one function and are passed down to the next generation. Genes are given names to identify them. The gene that is responsible for Fragile-X-syndrome is named FRM1. The FRM1
Human genetic engineering is the science of manipulating the genetic material of a female egg in order to get a wanted result such as avoiding hereditary diseases or to control the sex or looks of a child. Karp says, “To inject into the female reproductive tract could be considered one of the earliest forms of genetic engineering for humans by allowing couples incapable of conceiving to have children” (132). But how it’s done is complicated. The main procedure is a recombination of a part of the DNA of the male and female gametes at the fertilization stage or a recombination of a part of the DNA of a human embryo before implantation. If having a donor, they would use the donors DNA and inject it into the embryo.