Sexual reproduction involves crossing-over to mix up genes. Is this a good thing or a bad thing? In the discussion this week explain one pro and one con to crossing-over. Overall, what is your opinion of crossing-over? Can evolution occur without it? (Min. 50 words)

Offsprings produced by asexual reproduction are referred to as clones. Why?

1)Ganarles contain one kind of each chromosome because the homologous chromosomes separate during meiosis. True or False? 2)In humans, there are two alleles possible at the chromosome locus that determine blood type. True or False? 3) Mendel was a famous naturalist who developed the concept that lead to the laws of evolution. True or False? 4) Embryonic stem cells come from embryos made for research. True or False? 5) An organisms environment history, in addition to the phenotype, can influence the genotype. True or false? 6) During métodos homólogos chromosome sorteaste and the daughter cells have one copy of each kind of chromosome. True or False? 7) the surtidor include all the pair of chromosome except the X and Y Chromosome. True or False? 8) during DNA replication, the patent DNA molecule unerring and unzips. Then reach old stand serves as a template for a new stand. True or False? 9) mutations due to replication errors and environmental factors are quite common due to the proof…

Humans have two different sex chromosomes, X and Y. Figure 4 below shows the inheritance of sex in humans. Figure 4 Mother Father XX XX Y XY XY a) Copy the diagram into your answer booklet and draw a circle on the part of Figure 4 that shows an egg cell. b) What is the genotype of the male offspring? c) A man and a woman have two sons. The woman is pregnant with a third child. What is the chance that this child will also be a boy?

Which of the following is least likely to produce genetic variation in the offspring of an individual? (a) a DNA replication error caused by DNA polymerase in a body cell of the individual (b) a cross over event during meiosis that creates a new combination of alleles in the gametes (c) independent assortment of chromosomes during meiosis that creates a new combination of alleles in the gametes (d) the random fertilization of an egg cell by a sperm cell during sexual reproduction

(grade 11 biology) When the product of your coin toss combines with the product of your ‘mates’ coin toss, what process are you simulating?

White (w) coat color in guinea pigs is recessive to black (W). In 1909, W. E. Castle and J. C. Phillips transplanted an ovary from a black guinea pig into a white female whose ovaries had been removed. They then mated this white female with a white male. All the offspring from the mating were black (W. E. Castle and J. C. Phillips. 1909. Science 30:312–313). a. Explain the results of this cross. b. Give the genotype of the offspring of this cross. c. What, if anything, does this experiment indicate about the validity of the pangenesis and the germ-plasm theories

Let's go back to the image from the "Think About It." Use your new vocabulary, evidence from the lessons, and scientific reasoning to support the claim, "While there are many types of asexual reproduction, all types result in offspring identical to each other and the original parent." You may include a model or sketch as support for the claim. Submit your optional hand-drawn or digital model or sketch in the file upload question. B I iii !!! (a) (b) (C) (d) (e)

Hairlessness in dogs is inherited from a single dominant allele. Inheriting two dominant alleles is lethal for the embryo. Penelope, a hairless dog, is wildly attracted to a hairy dog, Arnold. They mate. The probability that Arnold's sperm fertilizing Penelope's oocyte results in a happy, hairless puppy is: O 1/2 O 3/4 O 1/3 Ο 1/4 O 2/3

#4:  knowledge in genetics