BIOL-K101 Lab 11&12 Quiz

[Punnett Square] If both your parents have sickle cell disease (ss), which answer below best describes the chances that you will be genotypically normal (SS), a carrier of sickle cell disease, or have sickle-cell disease (ss)?

0% homozygous dominant, 0 % heterozygous, 100% homozygous recessive

[Punnett Square] A woman with cystic fibrosis marries a man who is genotypically normal (CC). Which answer below best describes the chances that their child will: be genotypically normal, be a carrier for cystic fibrosis, or have the disease cystic fibrosis (cc) ?

0% homozygous dominant, 100 % heterozygous, 0% homozygous recessive

[Punnett Square] A woman is heterozygous for polydactyly and has 6 fingers on each hand. If the father of her child is normal (homozygous recessive), which answer below best describes the chances of her giving birth to a child who is genotypically normal (pp), is heterozygous with polydactyly, or is homozygous dominant for polydactyly?

0% homozygous dominant, 50% heterozygous, 50 % homozygous recessive

An animal with a diploid number of 36 chromosomes will have ________ chromosomes in its gametes and _________ chromosomes in its somatic cells

18;36

[Punnett Square] A couple has just found out that they are both carriers (heterozygous) for Tay-Sachs, a recessive metabolic disorder. Which answer below best describes the chances that their child will: be genotypically normal (TT), be a carrier for Tay-Sachs, or have the disease Tay Sachs (tt)?

25% homozygous dominant, 50% heterozygous, 25% homozygous recessive

[Punnett Square] One of your parents is genotypically normal for sickle cell disease (SS) and your other parent is a carrier for sickle cell disease. Which answer below best describes the chances that you will be genotypically normal (SS), a carrier of sickle cell disease, or have sickle-cell disease (ss)?

50% homozygous dominant, 50% heterozygous, 0% homozygous recessive

Non-disjunction of the 18th chromosome can lead to

Edwards syndrome

Separation of homologues occurs in ____, while separation of the sister chromatids occurs in ___

anaphase I, anaphase II

Homologous chromosomes synapse or pair during

prophase 1

Which of the following events does not occur during meiosis I?

separation of sister chromatids