1.
How many chromosomes do human sex cells have? (1 point)
22
43
46
23
2.
The actual genetic makeup of an organism for a particular trait is called the ______. The physical characteristic that trait gives the organisms is called the ______. (1 point)
genotype; phenotype
genome; allele
dominant; recessive
none of the above
3.
Of the following, which represents a homozygous recessive genotype?
(1 point)
TT
Tt
tt
TTT
4.
Structures in organisms that are no longer of use are called ______ structures. (1 point)
homologous
obsolete
vestigial
analogous
5.
Change in the hereditary features of a type of organism over time is ______. (1 point)
growth
biogenesis
spontaneous generation
evolution
6.
Studying the early growth and development of animals provides clues to their shared ancestry; this field of study is called ______. (1 point)
embryology
ecology
radiology
oncology
FOR #7-10: the answer choices are dominant, alleles, genetic engineering, recombinant, genes, recessive
7.
Because of ______, tomatoes can now be picked and transported great distances before they ripen. (1 point)
8.
Inserting a useful gene into the DNA of another organism is called ______ technology. (1 point)
9.
______ are different forms of a gene that codes for a certain trait. (1 point)
10.
Gregor Mendel discovered some alleles can cover up the presence of others; these alleles are called __________. (1 point)
My answers:
1. 23
2. genotype; phenotype
3. tt
4. vestigial
5. growth
6. embryology
7. genetic engineering
8. recombinant
9. alleles
10. recessive
your answers seem to be correct
are they right???
I will tell you they are right once u giv me the sucky suck in my own casa while yo mama watch u giv me the sucky suck.
1. To determine the number of chromosomes that human sex cells have, you can recall that humans are diploid organisms, meaning they have two sets of chromosomes. Human cells typically have 46 chromosomes, arranged in 23 pairs. However, sex cells, also known as gametes, are an exception. During the process of meiosis, gametes undergo a reduction division to produce cells with half the number of chromosomes as normal body cells. Therefore, human sex cells have 23 chromosomes.
2. The term that describes the actual genetic makeup of an organism for a particular trait is called the "genotype." This refers to the combination of alleles (alternative forms of a gene) that an organism possesses for that trait. The physical characteristic that the genotype produces in the organism is referred to as the "phenotype." It is important to note that the genotype determines the phenotype, as different combinations of alleles can result in different physical traits.
3. To identify a homozygous recessive genotype, you need to understand the concept of dominant and recessive alleles. In diploid organisms like humans, individuals inherit two copies of each gene, one from each parent. Homozygous refers to having two identical alleles for a particular gene. Recessive alleles are only expressed phenotypically when two copies are present, while dominant alleles are expressed phenotypically even if only one copy is present. In this case, the homozygous recessive genotype is represented by "tt," where both alleles for the gene are recessive.
4. Structures in organisms that are no longer of use are referred to as "vestigial" structures. These structures have reduced functionality or have lost their original purpose over time through evolutionary processes. Examples of vestigial structures in humans include the appendix and tailbone, which serve little or no biological function.
5. The term that describes a change in the hereditary features of a type of organism over time is "evolution." Evolution occurs as a result of various mechanisms, including natural selection, mutation, migration, and genetic drift. Through these processes, populations of organisms experience changes in their inherited traits over multiple generations.
6. The field of study that focuses on the early growth and development of animals to provide clues about their shared ancestry is called "embryology." Embryology involves the study of embryos and the processes of development from the fertilized egg to the formation of organs and body structures. By comparing the embryological development of different species, scientists can gain insights into evolutionary relationships and shared ancestry.
7. To answer this question, you need to understand that genetic engineering is the intentional manipulation of an organism's genetic material to introduce desired traits or modify existing ones. In the case of tomatoes being able to be picked and transported before ripening, this is a result of genetic engineering. Through the modification of tomato genes, varieties have been developed that delay ripening, allowing for longer shelf life and easier transportation.
8. The process of inserting a useful gene into the DNA of another organism is called "recombinant" technology or "recombinant DNA" technology. This technique involves combining DNA from different sources, such as a gene of interest from one organism, with the DNA of another organism. The resulting recombinant DNA can then be inserted into a host organism, where it will be expressed and produce the desired protein or trait associated with the inserted gene.
9. Different forms of a gene that code for a certain trait are known as "alleles." Alleles are alternative versions of a gene that can produce variations in a particular trait. For example, the gene for eye color in humans has different alleles for brown, blue, green, and other variations of eye color.
10. Gregor Mendel, often referred to as the "father of genetics," conducted groundbreaking experiments on pea plants and discovered the principles of inheritance. He observed that some alleles could mask or cover up the expression of others when present in the same individual. These alleles are known as "recessive" alleles. Recessive alleles require two copies to be present in an individual for their phenotypic effects to be expressed.