Homologous chromosomes — 1 inherited from each parent — pair along their lengths, gene by gene. Sexual reproduction is not as common, but when it does happen, the haploid gametes have 19 chromosomes. D Privet shrubs must be metabolically more like animals than like other shrubs.
This is critical for stable sexual reproduction through successive generations. C one-half blue short and one-half orange short gene eggs. Refer to the life cycles illustrated in the figure to answer the following question: 16 Which of the life cycles is typical for plants and some algae?
The chiasmata are broken in anaphase I as the microtubules attached to the fused kinetochores pull the homologous chromosomes apart Figure 4. Most animals and plants are diploid, containing two sets of chromosomes. At this stage, the four chromatids are visible in each homologous pairing and are called a tetrad.
Because crossing over can give rise to an additional unique combination of alleles, each occurrence would effectively double the number of genetically unique gametes - and because crossovers occur randomly this means that number earlier 70 trillion doesn't even begin to describe the potential variation in offspring that can exist given the three concepts listed.
Consider that the homologous chromosomes of a sexually reproducing organism are originally inherited as two separate sets, one from each parent. A dominant allele produces the same phenotype in heterozygotes and in homozygotes. How would you explain how independent assortment, crossing over, and random fertilization contribute to genetic variation?
Independent Assortment means the distribution of things where those things don't influence each other's distribution, in this case the chromosomes inherited from different parents mom and dad into different daughter cells during meiosis.
This process is also known as recombination. A prophase B metaphase C anaphase D interphase. D Privet shrubs must be metabolically more like animals than like other shrubs. C half the number of chromosomes and one-fourth the amount of DNA.
D half the amount of cytoplasm and twice the amount of DNA. Leeches seem like disgusting creatures with little intelligence. Refer to the life cycles illustrated in the figure to answer the following question: 16 Which of the life cycles is typical for plants and some algae?
Given these two mechanisms, it is highly unlikely that any two haploid cells resulting from meiosis will have the same genetic composition. During prophase I, chromosomes condense and become visible inside the nucleus. Polar bodies do not function as sex cells.