Which part of meiosis is most similar to mitosis?
a. Haploid cells
b. Crossing over
C. Meiosis II
d. Meiosis I
Which statement below best describes a polymorphism?
a. A genetic variant that can cause disease
b. A genetic variant that is usually harmless
c. A chromosomal deletion
d. An abnormal gene duplication
Match the term with the BEST definition:
- In Segmented blocks
Reprogrammed somatic cell
Derived from the inner cell mass
Involved in placenta formation
Where would you find a human embryo at the cleavage stage?
a. In the Trophoblast
b. In the uterus
c. In the Fallopian tube
d. In the ovary
All three germ layers can all give rise to what sort of cells?
a. Cartilage cells
b. Neuronal cells
c. Muscle cells
d. Epithelial cells
The image below shows expression (activation) of a Hox gene in the trunk and limbs of a mouse embryo. Expression of the gene is revealed by dark staining.
PICTURE IS OF EMBRYO WITH HANDS AND FEET DYED IN BLUE.
The gene is most likely to be?
Why might a loss of function mutation in a human HOX gene not cause a birth defect?
a. The protein may still be functional
b. Functional redundancy with other HOX genes
c. Humans lack the gene
d. The gene is active in mouse but not in humans
Which if the following could be considered a teratogen?
b. A hormone
c. A gene
d. A carbohydrate
Which statement below regarding teratogens is CORRECT ?
a. They only retard development
b. The time of exposure is not relevant
c. They are present in the genome
d. They can interact with genetics