Why are genetic diseases much more common among children of marriages involving first cousins than among children of marriages between unrelated partners?
What will be an ideal response?
This is because first cousins have many alleles in common, so the chances are greater for recessive alleles to be homozygous in children of first-cousin marriages.
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Jellyfishes are
a. polyp forms of cnidarians. b. medusae forms of cnidarians. c. spongiforms of cnidarians. d. spongiforms of echinoderms. e. polyp forms of echinoderms
All of these phyla are deuterostomes except for the:
1.Chordata 2.Echinodermata 3.Hemichordata 4.Nemertea
Migrating cells move around the developing embryo using ____
a. electrical signals b. genetic markers c. apoptosis d. adhesive cues e. osmosis gradients
The broad, flat part of a leaf is called the ____, while the stalk that attaches the leaf to the stem is called the ____
a. stipule; petiole b. blade; stipule c. stipule; axil d. petiole; axil e. blade; petiole