Answer:
<h2>(14+16)/1000 *100= 3</h2>
Explanation:
Parental combinations are always more common then other recombinant progenies.
A female fly is heterozygous for three X-linked genes crossed with an abc/Y male. . If single crossover occurs between a & b and between b & c, then the double cross is that, which occurs in both.
Double cross over progeny are always least in number, so here double cross occurs are in abC 14 and ABc 16.
So we are expecting that number of double cross over progeny= (14+16)/1000 *100= 3
Answer:
Typically in mammals, the gender of an organism is determined by the sex chromosomes. In the case of humans, this happens to be the X and the Y chromosomes. So as you may recall, if you are XX, you are female. If you are XY, you are male.
Answer:
The correct answer would be C.) The cell grows and makes a copy of its genetic material.
Cell cycle can be divided into two phases namely; inter-phase and mitotic phase.
Inter-phase or resting phase is the phase occurs between two consecutive mitotic phases.
It is sub-divided into three phases:
Gap 1 (G₁) phase: The cell actively performs its functions during this phase. It grows in size, transcribe and translate all the enzymes, proteins and other components which are necessary for replication of DNA (deoxyribonucleic acid).
Synthesis (S) phase: It is the phase during which DNA content of the cell is replicated or synthesized. After this phase, the DNA content of the cell doubles however, the chromosome number remains the same.
Gap 2 (G₂) phase: The cell resumes its growth and prepares itself for cell division or mitotic phase. The cell organelles like mitochondria and chloroplasts (in plants) also divide during this phase. The cell continues to grow until it enters mitotic phase.
Hence, we can conclude that the cell grows and makes copy of its genetic material ( usually DNA) before mitosis.
The answer is B, each gamete contains the same number of chromosomes as the mother. This is through cell division when the parent cells go through two rounds of meiosis 1 and meiosis 2, and all haploid gametes have 23 chromosomes.
