The presence of tight ligaments in the thumb is a recessive trait.

true
false

False.

Explanation:

Tight ligaments in the thumb is a dominant characteristic, associated with dominant homozygous alleles (AA), or hetero-biotic alleles (Aa).

Dominant genes are able to determine a specific trait even when they exist alone in a pair of alleles. Thus, they cause the manifestation of a specific physical trait, despite being accompanied by recessive alleles. Dominant alleles are classified in two different ways.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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