25. D, all of the statements are false, XX = female, XY = male and XXY = male with infertility and small reproductive organs.
26. A, 0 % The daughter must receive one of her X chromosomes from her normal father and will not be color-blind.
27. A, true
28. A, True
29. C, late blastula stage in mammals, in early stage of development.
30. C
31. A, androgen
D) A and B only E) A, B, and C 25. Which of the following statements...
Which of these statements is false? In humans, each of the 22 maternal autosomes has a homologous paternal chromosome. Single, haploid (n) sets of chromosomes in ovum and sperm unite during fertilization, forming a diploid (2n), single-celled zygote. At sexual maturity, ovaries and testes produce diploid gametes by meiosis. In humans, the 23rd pair, the sex chromosomes, determines whether the person is female X) or male (XY). Sexual life cycles differ with respect to the relative timing of meiosis and fertilization. Answer:D
Human Development-Sex Variations Individuals may acquire chromosomal sex variations, where the number and type of sex chromosomes are not average. A list of some of these variations is below. For each one, predict if the zygote would be assigned male or female or intersex at birth. Later, compare your predictions to the actual phenotypes. Zygote Phenotype Predicted Sex Sex Chromosomes Chromosomes in Gametes Sperm Egg XY Y X xX X X XO X none XYY X YY XX Y XXY...
True or False: Sex chromosomes in mammals Indicate whether each of the following statements about sex chromosomes in mammals is true or false. 01. Dosage compensation involves inactivation of the Y chromosome in males in order to equalize gene expression between the sexes.(Click to select) 02. One of the X chromosomes in each cell of a female is inactivated early in embryonic development, before the embryo's sex is determined. (Click to select) 03. In a female, the same X chromosome...
What causes de la Chapelle syndrome (XX male syndrome)? A. It is caused by two nondisjunction events. The first occurs during meiosis in the mother resulting in an XX egg, and the second occurs during meiosis in the father resulting in a sperm with no X or Y chromosomes. When this sperm fertilizes the egg it results in XX male syndrome. B. SRY is intact but the body is unable to respond to the hormone androgen, which produces the female...
1.a) How do we know that in humans the X chromosomes play no role in sex determination, while the Y chromosome causes maleness and its absence causes femaleness? c) How do we know that X chromosomal inactivation of either the paternal or maternal homolog is a random event during early development in mammalian females? d) How do we know that Drosophila utilizes a different sex-determination mechanism than mammals, even though it has the same sex-chromosome compositions in males and females?...
Which of the following statements is TRUE about X inactivation? A. Inactivation of a particular X chromosome depends on its genetic content. Inactivated X chromosomes are in some way "marked" such that all clonally related cells (daughter cells) have the same X chromosome inactivated. B. Inactivation of an X chromosome occurs at random early in embryonic development. Inactivated X chromosomes are in some way "marked" such that all clonally related cells (daughter cells) have the same X chromosome inactivated. C....
1. The somatic cells of a human male... A) contain 44 autosomes B) contain 22 autosomes C) contain an X and a Y chromosome D) A and C E) B and C 2. Which of the following statements is FALSE? A) The SRY gene triggers development of males B) The SRY gene is absent in females C) Embryos develop both male and female reproductive systems at first D) Males develop by ‘default’, and is prevented by the presence of 2...
Which of the following statements is TRUE? (a) Diploid organisms reproduce only sexually. (b) All sexually reproducing organisms have at least two copies of each gene at some stage in their life cycle. (c) Gametes have only one chromosome. (d) Another name for the unfertilized egg cell is the zygote. (e) Mutations in somatic cells are passed on to individuals of the next generation.
Question 1 (1 point) Which of the following conditions is characterized by excess mucus in lungs, digestive tract and liver? Question 1 options: A) hypercholesterolemia B) Sickle cell disease C) albinism D) cystic fibrosis Question 2 (1 point) The physical traits of an organism are called its: Question 2 options: A) gene B) genotype C) allele D) phenotype Question 3 (2 points) A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The...
Which of the following are TRUE? Select All That Apply Trisomy only occurs to chromosome 13 (Patau syndrome), chromosome 18 (Edward syndrome) and 21 (Down syndrome) since we have never seen individuals with trisomy in other chromosomes Poly-X syndrome is caused by non-disjunction, but Turner syndrome is caused by some othre factors In order for Jacob syndrome to happen, non-disjunction should happen during meiosis II and male X-linked genes affect female, but not male In pedigree analysis, if nother of...