Answer:
Crossing-over
Explanation:
Crossing-over is a phenomenon that occurs in the Prophase stage of meiosis I. Two chromosomes of a homologous pair comes together in a process called SYNAPSIS to form a TETRAD structure. While the chromosomes synapses, breaks occur at corresponding points in the non-sister chromatids i.e in one chromatid of each chromosome. Since the chromosomes are homologous, breaks at specific points mean that the segments that are broken off contain specific genes i.e. alleles. The broken sections are then exchanged between the chromosomes to form complete new units, and each new recombined chromosome of the pair can go to a different daughter sex cell.
In meiosis, the maternal and paternal chromosomes can be shuffled into daughter cells in many different combinations. The resulting chromosomes are not entirely maternal, neither are they entirely paternal. This ensures genetic variation in sexually reproducing organisms.
Answer:
nose, trachea, bronchioles, alveoli, cells
Explanation:
B. notochord
C. pharyngeal slits
D. dorsal fin.
2. Ancient chordates are thought to be most closely related to which of the following species?
A. spiders
B. earthworms
C. octopi
D. sea stars
The notochord is a flexible, supporting structure found only in chordates. Ancient chordates are most closely related to octopi.
The correct answer for the first question is B. notochord. The notochord is a flexible, supporting structure found only in chordates.
It provides support to the body and serves as a precursor to the vertebral column in vertebrates. Examples of chordates include fish, birds, and mammals.
The correct answer for the second question is C. octopi. Ancient chordates are thought to be most closely related to cephalopods like octopi.
Both groups share certain characteristics in their body structure and development.
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Answer:
B and D
Part 2 is C
Explanation: edge
Answer: Gregor Mendel, pea plants were fundamental in allowing him to understand the means by which traits are inherited between parent and offspring. He chose pea plants because they were easy to grow, could be bred rapidly, and had several observable characteristics, like petal color and pea color.
Explanation:
Answer:
Gymnosperms
Gymnosperms- are named for producing seeds that are not enclosed in an ovary, where the majority of species also exhibit a unique, cone-shaped reproductive structure.
Explanation:
Hope it helps you 。◕‿◕。
During gameteformation, the individual alleles that comprise a gene must separate. The correct option is C.
As per Mendel's law of segregation, "during gameteformation, every gene segregates from each other so that each gameteconveys only one allele for each gene." The secondlaw of inheritance is the law of segregation.
During gameteformation, the individual alleles that comprise a gene must separate from each other in a particular way.
Thus, the correct option is C.
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The missing options of the question are:
Answer: The answer is C, the individual alleles that make up the gene must SEGREGATE (which means separate) during gamete formation, hence the name “law of segregation”
Explanation: Hope this helps