Q. Which of the following statements is true?
A. Chromosomes occur in pairs in higher plants and animals.
B. There are more chromosomes in a cell than there are genes.
C. All organisms have the same number of chromosomes.
D. A karyotype cannot determine if an organism is male or female.
Answer:
A karyotype cannot determine if an organism is male or female. Thus, the correct option is D.
<h3>
What is karyotype?</h3>
A person's entire set of chromosomes is known as their karyotype. The phrase can also refer to an image created in a lab showing a person's chromosomes separated from one cell and organized in numerical order. A karyotype can be used to check for chromosomal number or structural problems.
Males and females may have different karyotypes. For instance, human females have two X chromosomes while males have an X and a Y chromosome in their karyotype. Body (somatic) cells and egg and sperm cells have different karyotypes (gametes).
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Answer:
I think first one i don't really know
Explanation:
Answer:
False
Explanation:
What this sentence is describing is a negative feedback loop, not a positive. A Positive feedback loop causes additional change in the same direction.
Biological molecules such as proteins and DNA reveal differences between humans and chimps that would have taken around 7 million years to accumulate.
<h3>What is DNA?</h3>
All known animals and viruses have genetic information in the form of deoxyribonucleic acid, a polymer consisting of two polynucleotide chains that coil around one another to form a double helix. Ribonucleic acid is a type of nucleic acid, as is DNA.
The two DNA strands are known as polynucleotides because they are constructed from simpler monomeric units called nucleotides.
The four nucleobases that contain nitrogen—cytosine (C), guanine (G), adenine (A), or thymine (T)—along with deoxyribose and a phosphate group—make up each nucleotide. The sugar of one nucleotide and the phosphate of the following make covalent bonds, creating what is known as the phospho-diester linkage, which results in an alternating sugar-phosphate backbone.
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